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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Factor the following expression using the GCF: 2dr – 4r.
r(2d – 4)
2r(d – 2)
2(dr – 2r)
2r(d – 1)\

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Help me with my waves homework. I need to measure the 3 waves and answer the 2 questions.

Identify the feature of the ocean floor covered by the green box.



A. Coral Reef


B. Abyssal Plain


C. Beach


D. Mid-Ocean Ridge

How do you determine if an element is metal or non-metal?

PLEASE ANSWER THIS I AM DOING SCIENCE AND IT SUCKS


WHICH ONE IS A SCIENTIFIC PROBLEM


The fingerlings grown in 5% saline solution will grow
faster than the fingerlings grown in 10% saline solution.



What is the growth rate of the fingerlings in 5% saline
and 10% saline solutions?

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.

The photo shows an animal called a water flea. Which level of organization is it an example of?

A. Organism
B. Organ system
C. Cell
D. Tissue

What is found between Mars and Jupiter?
Is it Comets or is it Asteroid (NOT Asteroid belt)

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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

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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

Imagine that the moon’s orbit wasn’t elliptical and it that it did not orbit the earth at a 5 degree angle. How would this change the predictability of an eclipse happening every month?

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

laws
increased biodiversity
poaching
captive breeding

Cells use energy to carry out various cell processes. Which of the following molecules store energy for the cell to use?

Group of answer choices

Water

ATP

DNA

Chloroplast

An element has a mass of 39.2 and an atomic number of 19. How many protons does this element have? How many neutrons? How many electrons?

A car traveling around a corner at 18 meters per second is accelerating because it is changing its

1. mass.
2. speed.
3. direction.
4.displacement.

Please answer all of the questions , also please dont answer if your not going to seriously answer my questions.

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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

Which chemical equation best represents the law of conversation of matter?

Describe the chemical reaction based on the chemical equation below. Also, explain whether the equation is balanced.

(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

Choose all the answers that apply.

Which of the following is true about the carbon-oxygen cycle?

The atmosphere stores more carbon dioxide than the ocean.
Plants use oxygen to make food during photosynthesis.
Carbon dioxide is added to the atmosphere by burning fossil fuels.
Carbon dioxide is a waste produce of respiration.

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.

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1. Nobelium has an atomic number of 102 and an atomic mass of 259. Explain how to calculate how many neutrons are in the most common form of Nobelium. Include a mathematical expression to help explain your answer (example: 1+1 = 2)

2. The atomic mass of Mercury is 200.592. The atomic number for Mercury is 80. As protons and neutrons are only available as a whole, how do scientists determine an atomic mass reported as a decimal number? Explain your answer using Mercury as an example.

Which scientist's atomic model is most recent?
A. Dalton's
B. Rutherford's
O c. Thomson's
D. Bohr's