Chemistry Middle School

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?

Answers

Answer 1

C IS THE ANSWER BECAUSE HELIUM HAS JUST 2 ATOMS

Answer 2

Helium only has two electrons which fills the outermost shell

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:

He (2) => 1s²

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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Related Questions

?What statement best describes the arrangement of the atoms in an ethylene molecule?

Answers

Answer: Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

chemicals applied to the violin's surface can cause the wood in the finished violin to become stiff. Would this affect the speed of the waves traveling through the wood?

Answers

Answer:

Short answer yes

Explanation:

Long answer:

yes because if its stiffer its much more resistant to any touch causing the sound to be more sharp

What equation explains the relation between amperes, watts and volts?
I = W*V
I = W/V
I = W+V
I = W-V

Answers

W*V i believe because it comes down to this :
I is the current, W is wattage V is volts and the * is the thing that represents the Amperes (i’m not 100% but this is my best)

i’m pretty sure W*V
i wish you luck :)

If two objects have different temperatures, heat will flow from the warmer object to the cooler one until _________________________.
A. one reaches a temperature of zero
B. one runs out of energy
C. they reach the same or equal temperature
D. one is absorbed into the other

Answers

c , they reach the same or equal temperature z

C, the heat will flow to the cooler one until they reach equilibrium

Match these items.

1. imprint of plant or animal
original-remains fossil
2. undecayed plant or animal part
carbonized fossil
3. replaced by a mineral
petrified fossil
4. only carbon remains
cleavage
5. mountain
geology
6. from magma
metamorphic
7. from physical and chemical changes
igneous
8. sandstone
print fossil
9. helps identify rocks
landform
10. science of Earth
sedimentary

Answers

1. print fossil

2. carbonized fossil

3. petrified fossil

4. cleavage

5. landform

6. igneous

7. metamorphic

8. print fossil

9. geology

10. sedimentary

The print fossil, original-remains fossil, petrified fossil, carbonized fossil, landform, igneous, metamorphic, sedimentary, cleavage, and geology are the respective matches as given in the question.

Print fossil is imprint of plant or animal and basically known as fossil impression. Original-remains fossil comprises of the original tissues and parts of organism and undecayed plant or animal part. Petrified fossil is replaced by a mineral. Carbonized fossil is only carbon remains. Landform is a mountain. Igneous is from magma.

Metamorphic is from physical and chemical changes. Sedimentary rocks are sandstone. Cleavage helps to identify rocks. Geology is the study of science of earth.

Learn more about rocks and fossils:

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Science question! Please read the article and give 2 new facts (not about continental drift please)! Please do this and you get 20 points!

Answers

Answer:

1. Scientists can determine the age of the seafloor through rock samples.

2. An isochron is an imaginary line on a map that shows points that have the same age.

Explanation:

They can see where the earth was connected

Do you think rayon when burnt will stick to the body like other synthetic fibers?

Answers

In other words, since rayon is made from the plant fiber it does not get stick to our body while we burn it

it will not stick to the body most likely

PLEASE HELP QUARTER TWO IS ALMOST OVER AND I HAVE TO TURN THIS IN TODAY!!!

Answers

Answer:

5. Sensory transduction is the translation of the sensory stimulus into neuronal activity. It involves a variety of physical and chemical mechanisms.

6. The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.

7. The peripheral nervous system refers to parts of the nervous system outside the brain and spinal cord. It includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.

8. When a pin is poked in the finger the signals are received by the sensory neurons and it is sent to the brain via the spinal cord. The signals are processed (for removal of the hand) and sent toward the muscles by the motor neuron.

Two plant reproductive parts are described below.

Part 1: The tip of the female reproductive part that receives pollen from the stamen
Part 2: The male reproductive part that produces pollen

Which statement is true about the parts?
Question 8 options:

Part 1 is the stamen and Part 2 is the pistil.

Part 1 is the stigma and Part 2 is the ovule.

Part 1 is the ovule and Part 2 is the stigma.

Part 1 is the stigma and Part 2 is the stamen.

Answers

Part 1 is the stigma and part 2 is the stamen - that’s the best answer!

Organize it fossil

If somebody knows the answer please tell me

Answers

Answer:Carbon-14 dating is second column tho

Explanation:So i remember doing this in 5th grade at my school so if u send me ur email i. can try send you my labs i hate doing them.

Calculate the volume (in cm3
) of 54 g
of water at 1 ∘C
.
Express the volume in cubic centimeters to two significant figures.

Answers

157,464 I think this is the answer

since the density of water is 1, then 1g = 1cm^3. So the volume of 54g of water is 54cm^3 with 2 significant figures

Look at the reaction below.

H2SO4(aq) + Mg(s)->MgSO4(aq) + H2(g)

Which substance is the acid in the reaction?

Mg(s)

H2(g)

MgSO4(aq)

H2SO4(aq)

Mark this and return

Answers

Answer:

H2SO4

Explanation:

H2SO4 is actually one of the strongest acids, coming to pH value very close to 1 . Acids transfer their hydrogen ions to other substances , such as water , and usually have hydrogen their formula . In this case , H2SO4 has hydrogen in its formula and is acid in the case .

Hope it helps you !!

Answer:

person above me is right :)

Explanation:

How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)

a. The atom’s volume increases.

b. The atom’s mass increases.

c. The atom becomes positively charged.

d. The atom becomes negatively charged.

Answers

c. The atom becomes positively charged

if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom

C the atom becomes positively charged

B in total
pot
5. Lindsey built a clock with 16 divisions, which we'll call Lindsey Hours.
Just like our clocks, the hour-hand on Lindsey's clock goes around twice
per day. How many Lindsey Hours are in one day?
16
-12

Answers

16 x 2 = 32 . So, approximately, 32 Lindsey Hours in a day. Correct me if I’m wrong eheh

32 is the correct answer

plz help as soon as possible

Answers

Answer:

A. It forms on the earth's surface

Answer: Extrusive igneous rocks are formed when magma is cooled above the ground it forms on the earth's surface.

Explanation: Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.

Describe the function of organelle X and explain how it is important to the survival of the cell. In your answer, be sure to:

Answers

In your answer be sure to what

Be sure to.....? You didn’t finish

If a substance has a density of 19 g/cm3, then what is the mass of 8 cm3 of this substance?

Answers

The mass is 2.375 grams

The mass is 3.375 grams

Explain what a trait is in your own words.

Answers

character attributes are regularly marked with illustrative descriptive words, for example, tolerant, faithless, or envious. character quality models. regularly, somebody's character and character are interlaced.

Please help, I don't get what does this means

3. Name the compound sodium makes with the following elements.
(a) Calcium carbonate:

Answers

Answer: hydrogen-carbonate.

Explanation:Because when carbon dioxide is passed in excess it leads to a formation of hydrogen-carbonate.

I hope everyone finds this helpful

the reaction of sodium and calcium carbonate gives sodium carbonate

What force causes the measurement of weight?

Answers

Answer:

Gravity

Explanation:

Gravity is what causes you to weigh more or less.

What is gravity? Gravity is the force that pulls things together. Larger things with larger masses have more gravity. When you are on Earth, you would weigh more than on the moon, about 6 times more, in fact, because the gravity on Earth is 6 times stronger.

Gravity because it pushes down on an object

How to work out the relative mass of potassium? What is the calculation? ( explained very easily )

Answers

Answer:

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Relative Atomic Mass = Mass of one atom
———————————
(1/12)th Mass of one C12 atom

At room temperature, aluminum is a solid and water is a liquid. How do the particles of the solid aluminum compare to the particles of the liquid water?
A. The particles in the liquid water and the solid aluminum are the same. They both vibrate and move slowly.
B. The particles in the solid aluminum vibrate and are tightly packed, and the particles in liquid water slide past each other.
C. The particles in the liquid water vibrate and are tightly packed and particles in the solid aluminum slide past each other.
D.The particles in the solid aluminum are close together with no regular arrangement, and the particles in the liquid water are well separated with a regular arrangement.

Answers

Answer:

Explanation:

The particles in the solid aluminum vibrate and are tightly packed, and the particles in liquid water slide past each other. The particles in the liquid water vibrate and are tightly packed and particles in the solid aluminum slide past each other.

Hope this helps, have a good day : )

Which of the following statements fully describes what an object may do when it experiences unbalanced forces? Select the two best answers.

A. It may change directions.

B. It will move at a constant speed.

C. It may slow down.

D. It may slow down or speed up.

E. It will stay stationary.

Answers

Answer:b

Explanation:

The answer is A, and c

How did this piece of evidence change your thinking about the channel on Mars? Explain your ideas below.

Answers

The piece of evidence changed thinking about the channel on Mars because it shows that the rock was formed next to flowing water as such rock formations exist on Earth and were formed by flowing water.

Was there flowing water on Mars ?

The geologic process that could have created the channel on Mars is water moving. We can infer from the image that water running across the terrain on Mars created channels similar to those on Earth.

We can claim that the flowing of water creates the channels on Mars because when the water runs for a long period from the same region, it takes the sediments and creates channels.

Find out more on Mars at https://brainly.com/question/3964646

#SPJ1

Erosion, that mats isn’t just a dry planet & can have a diverse eco system

What is a difference between complete metamorphosis and incomplete metamorphosis?
Question 1 options:

Complete metamorphosis has 3 stages and incomplete metamorphosis has 4 stages.

Only complete metamorphosis has the nymph stage.

Complete metamorphosis has a larva and pupa stage.

Only insects that undergo complete metamorphosis can fly.

Answers

Answer:

C. Complete metamorphosis has a larva and pupa stage.

Explanation:

I hope this helps

I belive c !! Good luck

Which of the following solutions is more dilute?
A.The solution with 10 grams of honey and 100 mL of water.
B.The solution with 5 grams of honey and 100 mL of water.
C.The solution with 15 grams of honey and 100 mL of water.
D.The solution with 20grams of honey and 100 mL of water.

Answers

Answer: the solution with 5 grams of honey and 100 mL of water

Explanation:

Is a,,,,,,,,,,,,,,,??,,,??,,,,,,

True or False?
The chemical bond formed when two atoms share electrons is called an ionic bond.

Answers

Answer: False

Explanation:

You can search online or read it in a book.

Our solar system consits of eight planets. Which phrase correctly describes a planet?
A. a large celestial body that is composed of gas and emits light
B. any one of the primary bodies that orbit a star
C. many stars held together by gravity
D. space and all the matter and energy in it

Answers

B. (twenty characters blah blah blah) Have a great day/night!

B lol the answer is b have a good day

HELP! 100 POINTS! A cinder block is pulled 0.50 meters to the right in 3 seconds. What is the block's average speed to the nearest hundredth of a meter per second (m/s)?

Answers

Answer:
The average speed of the blocks are 0.36 m/S.
Explanation:
Average speed is defined as the ratio of distance covered per unit time. So if it is said that blocks are pulled to 0.9 m in the right side. This means the blocks cover a distance of 0.9 m from the origin and that distance is covered in 2.5 s. Thus, the average speed can be calculated from the change in speed
with respect to time. As at time t = 0, the speed is
also zero, and at time t = 2.5 s, the speed will be
Speed =
0.9 = 0.36
2.5
Since, in this case, the speed is equal to the average speed of blocks. So the average speed of the blocks will be 0.36 m/s.

Speed = 0.9 = 0.36
2.5
Since, in this case, the speed is equal to the average speed of blocks. So the average speed of the blocks will be 0.36 m/s.

What is an ellipse please help)

Answers

normal oval shape traced by a point moving in a plane so that the sum of the distance from the other points is constant.

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

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