Answers
Sodium has one valence electron in its 3rd orbit
Related Questions
A photon of light has an energy of 1.83 x 10-18). What is the wavelength of this light? Does this light fall in the IR, visible, or UV region of the electromagnetic spectrum?
Answers
Answer:
1.09 × 10⁻⁷ m
UV region
Explanation:
Step 1: Given and required data
Energy of the photon of light (E): 1.83 × 10⁻¹⁸ J
Planck's constant (h): 6.63 × 10⁻³⁴ J.s
Speed of light (c): 3.00 × 10⁸ m/s
Step 2: Calculate the wavelength (λ) of this photon of light
We will use the Planck-Einstein's relation.
E = h × c/λ
λ = h × c/E
λ = 6.63 × 10⁻³⁴ J.s × (3.00 × 10⁸ m/s)/1.83 × 10⁻¹⁸ J = 1.09 × 10⁻⁷ m
This wavelenght falls in the UV region of the electromagnetic spectrum.
Explain the Rules that determine how electrons are arranged around the nuclei of atoms. Use examples to explain the rules/principles.
Answers
Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.
By definition:
there are 7 energy levelsthere are 4 sub-levelsAufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits.Example: for hydrogen, its electronic configuration would be: 1s¹.The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.
Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.
In the sub-level s there can only be a maximum of 2 electrons, in sub-level p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.
The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on. The order is:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d¹⁰7p⁶
In this way, taking into account the atomic number Z of the element (which represents the number of protons of the element, and in a neutral atom it also indicates the number of electrons), the electrons that it has in the orbitals will be placed following the previously established.
For example, for hydrogen, whose atomic number is Z = 1, its electronic configuration would be: 1s¹.
Remember that the number 1 that precedes the representative letter of the orbital indicates the level of energy where the electron is located, the letter s indicates the type of orbital where the electron is located, and the exponent 1 indicates the number of electrons that are located in said orbital.
In summary:
there are 7 energy levelsthere are 4 sub-levelsAufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits.Example: for hydrogen, its electronic configuration would be: 1s¹.Learn more:
https://brainly.com/question/5429660A 1% solution of Ivermectin contains how many mcg per mL?
Answers
Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.).
What is Ivermectin ?
Antiparasitic medication ivermectin is used. It was first used in veterinary medicine to prevent and treat heartworm and acariasis after being discovered in 1975.
A steroid is not ivermectin. Drugs called steroids behave similarly to cortisol and work to reduce edoema in the body. Prednisolone, betamethasone, and other typical steroids are listed below. Ivermectin, on the other hand, is an anthelmintic medication.
Barbiturates (such as phenobarbital and butalbital), benzodiazepines (such as clonazepam and lorazepam), sodium oxybate (GHB), and valproic acid are a few of the medications that may interact with this medication.
Thus, Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.)
To learn more about Ivermectin, follow the link;
https://brainly.com/question/28524204
#SPJ2
Which has the larger first ionization energy—magnesium or phosphorus?
a
Phosphorus has the greater first ionization energy.
b
Magnesium and phosphorus have equal first ionization energies.
c
Magnesium, but not phosphorus, has a measurable first ionization energy.
d
Magnesium has the greater first ionization energy.
Answers
Answer:
The correct option is a
Explanation:
First ionization energy is the minimum amount of energy required to remove the most loosely bound electron (valence electron) from the outermost shell of a gaseous or neutral atom. Since it takes more amount of energy to remove more electrons, it (ionization energy) generally increases across the period and decreases down a group because the closer the outermost shell is to the nucleus, the more difficult/energy required to remove electrons in that shell.
Since magnesium and phosphorus are on the same period (period 3), it can be deduced from the explanation above that phosphorus has a greater first ionization energy than magnesium because phosphorus (5 valence electrons) has more electrons in it's outermost shell than magnesium (2 valence electrons).
QUESTION 20
A slice of pizza contains 17 g of fat, 25 g of carbohydrate, and an unknown amount of protein. If the piece of pizza contains a total of 750 kcal,
how many grams of protein does the slice of pizza contain? (The accepted caloric values for foods are 4.0 kcal/g for carbohydrate, 9.0 kcalg
for fat, and 4.0 kcal/g for protein.) Report the answer to 2 significant figures.
429
O Can not be determined from the given information.
O 649
O 749
120 g
Save All Answ
MacBook Pro
Answers
Answer:
Explanation:
Let the protein contained in pizza be m gram .
calories contained by 17 g of fat = 17 x 9 kcals = 153 kcals .
calories contained by 25 g of carbohydrate = 25 x 4 kcals = 100 kcals .
calories contained by m g of protein = m x 4 kcals = 4 m kcals .
Total calories of slice of pizza = 153 + 100 + 4m kcals
= 253 + 4m kcals
Given ,
253 + 4m = 750
4m = 497
m = 124.25 g .
120 g ( rounded to two significant figures )
do guitar strings deform? and how??
Answers
Answer:
yes; and because of how roughly they are played.
Explanation:
A living thing must respond to the environment, has needs, grows, must be 1 point
able to reproduce, breathes/respirates, and is made of one or more cells. *
True
False
Answers
6. How many ions of Na are in 45.6 g of Na2SO4?
Answers
Answer:
3.85 ×10²³ Na⁺ ions
Explanation:
Given data:
Mass of Na₂SO₄ = 45.6 g
Number of ions of Na = ?
Solution:
Number of moles of Na₂SO₄:
Number of moles = mass/ molar mass
Number of moles = 45.6 g/ 142.04 g/mol
Number of moles = 0.32 mol
1 mole of Na₂SO₄ contain 2 moles of Na⁺ ion.
0.32 mol × 2= 0.64 moles of Na⁺ ion
1 mole contain 6.022×10²³ Na⁺ ions
0.64 mol × 6.022×10²³ Na⁺ ions / 1 mol
3.85 ×10²³ Na⁺ ions
what information do you obtain from molecular formula?
Answers
Answer:
Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol.
Explanation:
hope this helped !
Scientists did not know about cells before the 1600s because the
microscope had not been invented yet. *
O True
False
Answers
Many tests to distinguish aldehydes and ketones involve the addition of an oxidant. Only __________ can be easily oxidized because there is_________ next to the carbonyl and oxidation does not require _______
Answers
Answer:
AldehydesA hydrogen atomOxygenExplanation:
Many tests to distinguish aldehydes and ketones involve the addition of an oxidant. Only aldehydes can be easily oxidized because there is a hydrogen atom next to the carbonyl and oxidation does not require oxygen
This is not multiptle choice
Sound: Now click the Sound tab.
Part A
On the Sound tab, investigate briefly all the phenomena you explored with water waves above and describe any similarities in your results for sound. Specifically, describe
wave pattern as seen on the screen
shape and amplitude of the graph
effect of frequency on wavelength
effect of frequency on velocity
pattern with two sources
wave pattern with a single-slit barrier
Question 3
Light: Now click the Light tab.
Part A
On the Light tab, once again investigate briefly all the phenomena you explored with water and sound above. Describe any similarities in your results for light. Specifically describe
wave pattern as seen on the screen
shape and amplitude of the graph
effect of frequency on wavelength
effect of frequency on velocity
pattern with two sources
wave pattern with a single-slit barrier
Answers
Answer: Sound waves
The wave pattern that i observed in sound waves are longitudinal wave patterns.
The mathematical graph function looks like is a sine function graph. The pattern that i observed in the amplitude of the wave is longitudinal wave pattern
When you increase the frequency of the sound waves the wave moves faster but the wavelength becomes shorter. The higher the frequency results in higher the pitch of the sound.
If you increase the frequency the velocity of the sound wave remains constant for all valuses of frequencies.
i am currently completing this assigment. i am not usre if the answer are correct but i tried my best
I also got this from course hero it's your choise to put the one you want.
The wave pattern is identical to the pattern of the water. The graph is the same as the water except the wave height isn’t as big. Increasing the frequency increases the wavelength. Increasing the frequency also increases the velocity of the waves by a lot. With two sources the waves pass through each other. The wave pattern with a single slit barrier is the same as the water pattern.
Explanation:
Answer: Sound waves
The wave pattern that i observed in sound waves are longitudinal wave patterns.
The mathematical graph function looks like is a sine function graph. The pattern that i observed in the amplitude of the wave is longitudinal wave pattern
When you increase the frequency of the sound waves the wave moves faster but the wavelength becomes shorter. The higher the frequency results in higher the pitch of the sound.
If you increase the frequency the velocity of the sound wave remains constant for all valuses of frequencies.
i am currently completing this assigment. i am not usre if the answer are correct but i tried my best
I also got this from course hero it's your choise to put the one you want.
The wave pattern is identical to the pattern of the water. The graph is the same as the water except the wave height isn’t as big. Increasing the frequency increases the wavelength. Increasing the frequency also increases the velocity of the waves by a lot. With two sources the waves pass through each other. The wave pattern with a single slit barrier is the same as the water pattern.
Explanation:
Which molecule has a dipole moment?
A. Cl2 (linear geometry)
B. H2S (bent geometry)
C. CCIA (tetrahedral geometry)
D. CO2 (linear geometry)
Answers
B. I think im probly wrong
A similarity ratio of scale factor is the ratio of the lengths of the corresponding of two similar polygons
Answers
Answer:
go to hellfhshahahahahahahahahaha aha
Explahhhhahah
The density of aluminum is 2.7 g/mL if I add a piece of aluminum to a graduated cylinder of water in the water level increases by 8.2 ML what is the mass of the piece of aluminum
3.0 g
22 g
5.5 g
0.33 g
Answers
The speed of a wave in the string is 16.2ms. The mass per unit length of the string is 0.3ms calculate tension in the string
Answers
Answer:
The tension in the string is 78.73 N.
Explanation:
The tension in the string can be determined from the expression;
v = [tex]\sqrt{\frac{T}{m} }[/tex]
where: v is the speed of the wave in the sting, T is the tension in the string and m is the mass per unit length of the sting.
Given that: v = 16.2 m/s, and m = 0.3 kg/m.
Then;
16.2 = [tex]\sqrt{\frac{T}{0.3} }[/tex]
Square both sides to have,
[tex](16.2)^{2}[/tex] = [tex]\frac{T}{0.3}[/tex]
T = [tex](16.2)^{2}[/tex] x 0.3
= 252.44 x 0.3
= 78.732
T = 78.732 N
The tension in the string is 78.73 N.
What is the name of the following compound? Se5S6
Answers
Answer:
I'm sorry I couldn't find it, I looked all over the internet
2. How do the ancient Greek model and Ptolemy's model differ?
Answers
Answer:
Greek's Model used stars while Ptolemy did not use stars.
Explanation:
The Greek model had stars as part of the system and they revolved around the Earth. Ptolemy's model did not include the stars, but it did include the moons that revolves around the planets.
How many atoms are there in 4430 grams of lithium (Li)?
Answers
Answer:
3843.96 × 10²³ atoms
Explanation:
Given data:
Mass of Li = 4430 g
Number of atoms = ?
Solution:
We will calculate the number of moles first.
Number of moles =mass/molar mass
Number of moles = 4430 g/ 6.94 g/mol
Number of moles = 638.32 mol
1 mole contain 6.022 × 10²³ atoms
638.32 mol × 6.022 × 10²³ atoms / 1 mol
3843.96 × 10²³ atoms
What is the velocity of a plane to travel 3000 miles from New York to California in 4.5 hours
Answers
Answer:
[tex]velocity = \frac{displacement}{time} \\ v = \frac{3000}{4.5} \\ v = 666.67 \: miles \: per \: hour \\ or \\ v = 666 \frac{2}{3} \: miles \: per \: hour[/tex]
True or false: In a chemical reaction, atoms of elements cannot be present in the products if they were not present in the reactants.
A
True
B
False
Answers
Answer:
A
Explanation: Your answer is A true
Which of the processes is exothermic?
a) evaporation of alcohol
b) sublimation of iodine
c) solidification of volcanic lava
d) burning of paper
Answers
Answer:
Choice C as my opinion
Explanation:
solidification of volcanic lava has to do with changes in earth and the thermal structure that's just a point not sure though
hope I was helpful though thank you
Answer:
c) solidification of volcanic lava
Explanation:
heat is being lost to the outside surroundings "exo" thermic
HELP ASAP PLEASEEEEE!!!!! (serious answers only or i’ll report)
Mg(s)+2HCl(aq)—>MgCl2(aq) + H2(g)
what is the order of the reaction between magnesium and hydrochloric acid, with respect to magnesium?
Answers
Answer:
1st order
Explanation:
because magnesium has a coefficient of 1, it is first order
hydrochloric acid has a coefficient of 2, so it is second order
overall the reaction is third order (1+2)
Suppose you have 2.50 L of a substance with a density of 8.00 g/mL and you want to determine the mass of the substance. The calculation can be broken down into three steps. First, convert the volume from liters to milliliters. Then, determine the mass of the sample in grams. Finally, convert the mass from grams to kilograms. Show the unit analysis by placing the correct components into the unit‑factor slots. The question marks (?) represent the answer to the previous step.
Answers
Answer:
20 kg
Explanation:
From the question given above, the following data were obtained:
Volume (V) of substance = 2.50 L
Density (D) of substance = 8.00 g/mL
Mass (m) of substance =?
Next, we shall convert 2.50 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
2.50 L = 2.50 L × 1000 mL / 1 L
2.50 L = 2500 mL
Thus, 2.50 L is equivalent to 2500 mL.
Next, we shall determine the mass of the substance. This can be obtained as follow:
Volume (V) of substance = 2500 mL
Density (D) of substance = 8.00 g/mL
Mass (m) of substance =?
D = m / V
8 = m / 2500
Cross multiply
m = 8 × 2500
m = 20000 g
The mass of the substance is 20000 g.
Finally, we shall convert 20000 g to Kg
This can be obtained as follow:
1000 g = 1 kg
Therefore,
20000 g = 20000 g × 1 kg / 1000 g
20000 g = 20 kg
Therefore, the mass of the substance is 20 Kg
Following intense exercise, the blood pH was determined to be 7.1. If the HCO3- is 7.5mM and the pKa for HCO3- is 6.1, what is the CO2 concentration in the blood
Answers
Answer:
[tex]0.75\ \text{mM}[/tex]
Explanation:
Concentration of [tex]HCO_3^-[/tex] = [tex][HCO_3^-]=7.5\ \text{mM}[/tex]
[tex]pK_a[/tex] for [tex]HCO_3^-[/tex] = 6.1
[tex]pH[/tex] of blood = 7.1
The reaction is as follows
[tex]H_2CO_3+H_2O\rightarrow HCO_3^-+H_3O^+[/tex]
From the Henderson equation we get
[tex]pH=pK_a+\log\dfrac{[HCO_3^-]}{[H_2CO_3]}\\\Rightarrow 7.1=6.1+\log \dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 1=\log\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 10^1=\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow [H_2CO_3]=\dfrac{7.5}{10}\\\Rightarrow [H_2CO_3]=0.75\ \text{mM}[/tex]
[tex]CO_2(g)+H_2O(l)\rightarrow H_2CO_3(aq)[/tex]
Concentration of [tex]H_2CO_3[/tex], [tex][H_2CO_3]=[CO_2][/tex]
Concentration of [tex]CO_2[/tex], [tex][CO_2]=[H_2CO_3]=0.75\ \text{mM}[/tex].
This is something I really need help in pls
Answers
Answer:
3 m/s2
Explanation:
i looked it up on quizizz and it showed 3 m/s2
how to be happy, i miss them
Answers
you have to not let your past or your sad thoughts get the best of you.. that what I do i do get sad sometimes but dont let that get u down
Answer:
focus on whats ahead of u, not behind u ok?
Explanation:
hope this helps
1. How many moles of sulfur are in 40g of sulfur?
Answers
Answer:
1 sulfur
Explanation:
1 mole is equal to 1 moles Sulfur, or 32.065 grams
Answer:
[tex]\boxed {\boxed {\sf 1.24727159 \ moles \ of \ sulfur }}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass found on the Periodic Table of Elements.
1. Molar Mass
This is a sample of sulfur, so look for S on the table.
S: 32.07 g/mol2. Convert from Grams to Moles
Use the molar mass as a ratio.
[tex]\frac { 32.07 \ g \ S}{ 1 \ mol \ S }[/tex]
Multiply by the given number of grams: 40
[tex]40 \ g \ S * \frac { 32.07 \ g \ S}{ 1 \ mol \ S }[/tex]
Flip the fraction so the grams of sulfur will cancel each other out.
[tex]40 \ g \ S * \frac {1 \ mol \ S }{ 32.07 \ g \ S}=40* \frac {1 \ mol \ S }{ 32.07 }[/tex]
[tex]\frac {40 \ mol \ S } { 32.07 } = 1.24727159 \ mol \ S[/tex]
There are 1.24727159 moles of sulfur.
how does the mass and size of an atom compare to the mass and size of the nucleus
Answers
Answer:
Explanation:
The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.
Answer:
The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.
Explanation:
The most common source of copper (CuCu) is the mineral chalcopyrite (CuFeS2CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 395 gg of pure CuCu
Answers
Answer:
1.14kg of chalcopyrite
Explanation:
In 1 mole of chalcopyrite, CuFeS₂, there is 1 mole of Cu. Thus, to solve this question we need to convert the mass of pure Cu to moles using molar mass (Cu = 63.546g/mol). Then, the moles of Cu are equal to moles of chalcopyrite that must be converted to grams and then to kg (CuFeS₂: 183.54g/mol)
Moles Cu:
395g Cu * (1mol / 63.546g) = 6.216 moles Cu = 6.216 moles CuFeS₂
Mass chalcopyirite:
6.216 moles CuFeS₂ * (183.54g/mol) = 1140.9g
In kilograms:
1140.9g * (1kg / 1000g) =
1.14kg of chalcopyrite