Helium is a "special" element in Group 18 because it does not have 8 valence electrons. Why doesn't helium have 8 valence electrons like all the other elements in group 18?

C IS THE ANSWER BECAUSE HELIUM HAS JUST 2 ATOMS

Helium is an element which belongs to a family called noble gas.

Among the noble gas element, helium is the only member with two (2) electrons.

Helium is a s-block element. S-block can only accommodate a maximum of 2 electrons. The two (2) electrons that helium has complete its outermost shell as seen from its electronic configuration below:

Since the outermost shell of helium is completely filled, it is thus included in the noble gas family (i.e group 18).

Other members of the this group include: Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)

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Brainliest answer please im not wasting my points for no reason please this is the last one and then im done please thank you
What do the solid lines on the topographic map represent?


A. changes in rock types

B. lines of equal pressure

C. lines of equal elevation

D. changes in vegetation

What is a change in matter that results in a change in its identity and properties? *

Please help, I’ll fr give 5 stars and Brainliest ;-;

Which best protects animal species that are endangered due to overhunting?

laws
increased biodiversity
poaching
captive breeding

Thermal energy “flows” from warmer areas to colder areas. Heat is a measure of this flow.

True or False

FIRST TO ANSWER GETS 30 POINTS


Classify the following as physical, biological, applied science

1. Chemistry 7. Parasitology

2. Zoology 8. Volcanology

3. Engineering 9. Genetics

4. Metallurgy 10. Pasteurization

5. Medicine 11. Aviation

6. Microbiology 12. Bacteriology

(04.01 MC) 20 POINTS!!!!!!!!!!!!!!

Greg wrote the following steps in the formation of sedimentary rocks.

Step 1: Weathering of rocks forms sediments
Step 2: Sediments are heated
Step 3: Sediments are deposited
Step 4: Compaction and cementation forms rocks

Which step contains an error?

Select one:
a. Step 1
b. Step 2
c. Step 3
d. Step 4

Identify the following as examples of abiotic or biotic factors. Mark “A” for abiotic factors or “B” for biotic factors

_________Climate

_________Grass

_________Seaweed

_________Soil

_________Coyote

_________Altitude

_________Precipitation

_________Termite

_________Spider

_________Sunlight

300 g of requires 30000 J of thermal energy to raise the temperature from 25 °C to 85 °C, what is the heat capacity of water? ANSWER ASAP PLEASE

plzz help meee!
Noah rides his bike 16 kilometers in 2 hours. What is his average speed?

Question 9 options:
A)
8 miles per hour
B)
8 kilometers per hour
C)
32 meters per hour

which two statements are true for both compounds and mixtures
A. Their particles are held together by chemical bonds
B. Their particles all have the same chemical formula
C. They are made up of more than one type of atom
D. They can be separated into two or more elements

Is a comet found between Mars and Jupiter
This is a Yes or No question
Thank you, Subject is science

Speed is defined as the distance an object travels per unit of time. Which TYPE of speed is observed when you look at the speedometer of a car?

Question 7 options:

A)
Constant Speed
B)
Instantaneous Speed
C)
Average Speed

Which elements have 8 valence electrons?

This photo shows a kind of reproduction. Which of the following describes this type of reproduction?

A. Two parents are required to produce this offspring.
B. Each offspring has a different combination of genes.
C. The offspring have identical genes.
D. Parents make reproductive cells with only half of their genes.

Rocks around mid-ocean ridges teach scientists about
A. how wide abyssal plains are
B. how earthquakes happen
C. changes in the earth's crust
Will give brainlest

What is the mass of the ethyl alcohol that exactly fills a 400.0 mL container? The density of ethyl alcohol is 0.789 g/mL.

When citric acid reacts with baking soda, a salt, water and a gas are produced. What is the name of the gas?

a) carbon dioxide
b) oxygen
c) sodium citrate
d) water vapor

NASCAR fans love race day when they get a chance to cheer their favorite team! If a driver was able to travel 600 miles in 3 hours, what is her average speed? Be sure to use the correct formula (s=d/t)

Question 8 options:

A)
1800 mph
B)
200 mph
C)
300 mph

Hey Guys... I need help again...
Having freckles (F) is dominant over not having freckles (f). A parent with freckles is crossed with a parent without freckles. The Punnett square shows the possible genotypes of the offspring.


What is the genotype of each square?

A: FF Ff ff

B: FF Ff ff

C: FF Ff ff

D: FF Ff ff

Put the levels of organization in order with 1 being the largest and most complex and 7 being the smallest and most specific.

Question 3 options:

ORDER

CLASS

KINGDOM

SPECIES

PHYLUM

GENUS

FAMILY

DOMAIN

What do you understand by Biological nitrogen fixation? PLEASE ANSWER RN

What is the center of a plant cell? The actual question is what’s the center of an onions root tip?

Based on your knowledge of how the greenhouse effect works, why does the level of carbon dioxide affect the global temperature?
This is for science, I need it in my own words.
I will give brainless.

Identify each picture.
Answer Choices are in attachment.

Which definition is correct?

a physical change creates a new substance because bonds are broken or formed
a physical change can happen without changing any characteristics of the substance
a chemical change occurs when the substance remains the same but the shape, or other physical characteristics change
a chemical change produces a new substance by breaking and forming new bonds

Two cars are moving with the same speed. The VELOCITY of both cars will be the same if the cars are moving in:

1. circles.
2. parallel paths.
3. straight lines.
4. the same direction.

Please i really need help

When we talk about substances dissolving we usually follow the rule " like disssolves like". What does that mean? (selct TWO correct answers)


Nonpolar molecules will dissolve other nonpolar molecules


Nonpolar molecules will dissolve polar molecules


Polar molecules will dissolve nonpolar molecules


Polar molecules will dissolve other polar molecules

Example of Scientific question?