Is this isotope stable or radioactive?

Answer:

O

2−

:

Explanation:

The atomic number of O=8=number of electrons

Number of electrons in O

2−

are 8+2=10

Electronic configuration will be 1s

2

2s

2

2p

6

Answer:

The volume of stone is 5cm³.

Explanation:

Given data:

Volume of water = 30 cm³

Volume of water and stone = 35 cm³

Volume of stone was 5 cm³ = true or false

Solution:

To check weather the given volume of stone is true or not we have to calculate the volume of stone from given data.

Volume of stone = (volume of water + stone ) - volume of water

Now we will put the values.

Volume of stone =  35 cm³ - 30 cm³

Volume of stone = 5 cm³

Thus the given value is true. The volume of stone is 5cm³.

Answer:

Average atomic mass of Cl = 35.48 amu

Average atomic mass of B  = 10.8  amu

Average atomic mass of Ag  = 107.96 amu

Explanation:

1)

Given data:

Abundance of Cl-35 = 75.8%

Abundance of Cl-37 = 24.2%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (75.8×35)+(24.2×37) /100

Average atomic mass =  2653 + 895.4 / 100

Average atomic mass  = 3548.4 / 100

Average atomic mass  = 35.48 amu

2)

Given data:

Abundance of B-10 = 19.8%

Abundance of B-11 = 80.2%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (19.8×10)+(80.2×11) /100

Average atomic mass = 198  +882.2  / 100

Average atomic mass  = 1080.2 / 100

Average atomic mass  = 10.8  amu

3)

Given data:

Abundance of Ag-107 = 52%

Abundance of Ag-109 = 48%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (52×107)+(48×109) /100

Average atomic mass =  5564 +5232  / 100

Average atomic mass  = 10796 / 100

Average atomic mass  = 107.96 amu

A sample of oxygen gas at STP is depicted in the diagram in the picture (4) of the image attached.

An oxygen molecule is a diatomic molecule, which is a molecule made up of just two atoms of the same element. The oxygen molecule in this instance is made up of two oxygen atoms.

If you have a lot of oxygen atoms at STP, they will spontaneously combine to produce O₂ because double bonds between oxygen atoms make their structure more stable.

If we carefully examine the figure in the attached image, we will see that it depicts a molecule made up of two atoms of the same element, which perfectly matches the definition of the oxygen molecule.

Therefore, this is shown in diagram (4), spontaneously combine to produce O₂  because double bonds between oxygen atoms make their structure more stable.

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Answer:

the answer is the location of the WORLD is the same as the answer to the answer

Answer:

C. Malleability

Explanation:

The malleability of aluminum allows it to be formed into thin sheets.

Physical properties tells us about what a substance is when no change is occurring to its constituents.

Answer:

C

Explanation:

Given parameters:

Volume of the ruby = 575cm³

Density of the ruby = 3.97g/cm³

Unknown:

Mass of the largest ruby = ?

Solution:

Density is the mass per unit volume of a substance. It is an intrinsic property of matter that is unique to each of them.

Mathematically;

         Density = [tex]\frac{mass}{volume}[/tex]

Since mass is the unknown;

             Mass = density x volume

Input the parameters and solve;

          Mass = 3.97 x 575 = 2282.75g

The mass of the largest ruby is  2282.75g

Answer:

D

Explanation:

Because do all of that and then you do a conclusion

Answer:

C-

Ionic

Explanation:

Just did the quiz

The bonding occurs between the valence electron of an atom. The ionic bond involves the transfer of electrons between atoms. Thus, option c is correct.

A chemical bond that involves the complete transfer of electron/s from one element to another in a molecule or compound is an ionic bond.

The ionic bonds comprise cations that gave the electron to another element called the anion that gained or accepted the electron. This results in an attractive force between them to form a bond.

The positive and negative charges attract one another which leads to the formation of the ionic bond. The most common example is NaCl in which sodium has a positive and chloride has a negative charge.

Therefore, option c. ionic bond involves the transfer of electrons.

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oxygen has 6 valence electrons and 2 electrons and carbon has 4 electron

Answer:

4!!!!!!!!!!

Explanation:

i got it right

Answer:

chemical

Explanation:

i did that stuff in 5th grade  

Answer:

Iron have 26 atomic and sodium have 11 atomic

Explanation:

The sodium is a non-transition metal. Its melting point is low and boiling points and is a soft metal, whereas iron is a transition metal with very high melting and boiling points, It is a hard metal.

The term transition metal is defined as any of various metallic elements such as chromium, iron, and nickel that have valence electrons in two shells instead of only one.

Between the s-block and p-block elements in the periodic table are transition metals. As a result, they are known as d-block elements.

Sodium is soft, has a much lower melting point than water, and reacts with it violently, producing heat and hydrogen or even exploding. Additionally, sodium and water react to create a hazardous compound.

Thus, these are difference between the properties of sodium and iron.

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Answer:

124.586

Explanation:

Answer:

3 g/cm3

Explanation:

d=m/v

=45/15

= 3 g/cm3

Answer:

2.46621 cm

Explanation:

i used the formula p = m/V

Answer:

Used as rocket fuel, is a fertilizer ingredient, used in cooking, used to provide lighting, and used in production of other compounds

Explanation:

Hope this helps!!!

Answer:

For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.

Explanation:

Given data:

Mass of glucose = 10 g

Mass of oxygen required for complete combustion = ?

Solution:

Chemical equation:

C₆H₁₂O₆ + 6O₂    →  6CO₂ + 6H₂O

Now we will convert the given mass of glucose into number of moles.

Number of moles = mass/ molar mass

Number of moles = 10 g/ 180.156 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of glucose with oxygen.

         C₆H₁₂O₆            :              O₂

            1                     :               6

          0.06                :            6×0.06 = 0.36 mol

Mass of oxygen required:

Mass = number of moles × molar mass

Number of moles  = 0.36 mol × 32 g/mol

Number of moles = 11.52 g

For the complete combustion of 10 g of glucose 11.52 g of oxygen is required.

Answer:

No

Explanation:

I do not know

Explanation:

No because when it was formed it was a rocky lava wasteland

Answer:

Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. ... In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.

Answer:

heating point for water - 100°

The melting point (MP) of a substance is the temperature at which it melts. A solid's melting point is a physical characteristic that can be used to identify a substance. Here the correct option is B.

The melting point of a solid is the temperature at which it begins to liquefy. A substance's normal melting point is its melting point under atmospheric pressure. Ice often melts at 0 degrees Celsius.

A physical process called melting or fusing causes a substance to change its phase from a solid to a liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.

Thus the correct option is B.

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Answer:

1.33

Explanation:

sorry if im wrong :(

Answer:

Density

Explanation:

The ratio of mass to the volume of an object is called its density. Unit of mass is grams and that of volume is mL.

Density = mass/volume

[tex]\text{Density}=\dfrac{\text{grams}}{\text{mL}}\\\\=\text{grams/mL}[/tex]

If you are calculating the grams to mL ratio, it means that we are trying to find the object's density.

Answer:

because it is going from a solid to a gas.

Explanation:

also it's still cold

Answer : The correct option is (b) [tex]1.01\times 10^{24}[/tex]

Explanation : Given,

Mass of cesium = 223 g

Molar mass of cesium = 133 g/mole

First we have to calculate the moles of cesium.

[tex]\text{Moles of cesium}=\frac{\text{Given mass cesium}}{\text{Molar mass cesium}}[/tex]

Now putting all the given values in this formula, we get:

[tex]\text{Moles of cesium}=\frac{223g}{133g/mol}=1.67mol[/tex]

Now we have to calculate the number of atoms of cesium.

As, 1 mole of cesium contains [tex]6.022\times 10^{23}[/tex] atoms of cesium

So, 1.67 mole of cesium contains [tex]1.67\times 6.022\times 10^{23}=1.01\times 10^{24}[/tex] atoms of cesium

Therefore, the number of atoms of cesium are [tex]1.01\times 10^{24}[/tex]

A non-renewable also know as a finite resources are those resources whose availability is limited and can diminish is not used in a proper manner.

Eg:- fossil fuels, crude oil/petroleum, natural gas, and nuclear fuels.

Explanation:

Renewable resources  are those resources that can be repeatedly used and cannot run out of stock as they are naturally replaceable.

Eg:-Wood,Paper,Cotton

Among the options mentioned in the above question steel is not a renewable resource. Steel is made up of iron ,which is mined from the ground.

Brainliest?

The statement is "the steel frame used to make the bike."

A non-renewable resource is one that cannot be replenished by natural processes at a rate fast enough to keep up with use. Carbon-based fossil fuels are an example.

Metals are essential and valuable resources in general. Metals are extremely recyclable and reusable, despite the fact that their natural supply or the supply of components used to make diverse alloys are set.

Steel is created from iron, a nonrenewable resource.

Hence the correct option is A.

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Answer:The atoms in gases are far apart from each other, so they are much more disordered than either liquids or solids.

Explanation:

Answer:

A is √34

Explanation:

We can solve for the hypotenuse "A" using the Pythagorean theorem.  

a²+b²=c²

3²+5²=c²

9+25=c²

34=c²

√c=√34

c=√34 --> A