Which of the elements shown has an atomic mass of 20 amu?

A) A
B) B
C) C
D) D

The elements shown have an atomic mass of 20 amu is Neon.

The atomic number of an atom is its total number of protons and neutrons.

Neon has an atomic mass of about 20 this isotope contains 10 protons and 10 neutrons.

Actually, Neon would be listed as having an atomic mass of about 20.18 because of a mixture of isotopes.

Z= Atomic number the number of protons in the nucleus which defines the element.

In this case,  Z=10 and this means neon but there are also 10 neurons in the nucleus of the major isotope which gives it 20Ne.

Hence, option D is the correct answer.

Learn more about the atomic mass here:

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What volume (in L) of carbon dioxide will be produced from the reaction of 37.4 L of oxygen?​

Which of the following organisms is the most complex?

A. Paramecium
B. Amoeba
C. Volvox
D. Euglena

The genotype RR would be considered a purebred and the genotype Rr would be considered a hybrid. *

True or False

What is the symbol of element Californium?

Determine the products of the following reaction:
Ca(OH)2 (aq) + 2 CuCl(aq) →
(aq) +
H(s)
:: Caci
:: CaCl2
+ CuOH
:: Cu(OH)2
*: CIOH
:: Cacu

What is the oxidation state of CI in CIO-

-1
+2
+1
0

What is the Molar Mass of Iron(Fe)? and also state how many particles there are in one mole of iron. will give brainliest to first answer

Which statement correctly describes acetyl-CoA?
It connects glycolysis to the citric acid cycle.
It connects the citric acid cycle to the electron transport chain.
It is the product of catabolism of proteins.
It is the product of catabolism of fats.

PLS HELPPPPP ASAP
How many grams of Oxygen are in 7.2 grams of C12H22011? Round your answer to the hundredth place (0.01)

Which region contains elements with five valence electrons ?

In the ocean, there are small fish that live in and around the mouths of large sharks. The shark does not harm the fish because the fish pick food from between the shark’s teeth. In return, the small fish benefit from food the sharks find. Which form of symbiosis exists between the sharks and the small fish?


commensalism


mutualism


parasitism


predation
please help

The photo shows a person holding a frozen smoothie. Which statement best explains why the smoothie is melting?

IF RIGHT I WILL GIVE BRAINLIEST
Which of the following types of soil would have the highest porosity?
A. 50% sand, 50 % clay
B. 80% sand, 20% silt
C. 40% clay, 60% silt
D. 80% clay, 20% sand

HELPP ME ASAP
What is the percent composition of Nitrogen in dinitrogen trioxide?

help me with this asap rocky pleasee

Jenny read that most of Earth’s water is salt water, while only 3% is fresh water. She also read that not all of the fresh water is accessible. Most of Earth’s fresh water is tied up in which two areas?

A. glaciers and underground
B. ice and glaciers
C. underground and lakes
D. glaciers and lakes

The following flow diagram shows the various steps of elimination of waste through urine. There is an error in one of the steps. (5 points)



What is the error in the diagram?
Step 2 should be the ureters carry urine to the urethra.
Step 2 should be the kidneys carry urine to the bladder.
Step 3 should be urine leaves the body through kidneys.
Step 1 should be urine flows from the kidneys to the ureters.

Which detail supports the main idea Bats are useful to humans?
Bats often live in large colonies in caves and under bridges.
Bats are the only mammal that truly flies.
Bats eat hundreds of mosquitoes and other annoying insects at night.
Some bats carry rabies, a deadly virus.

When are atoms considered to be stable?

The transfer of pollen grains from another of a male to the stigma of female flower

What is the formula for tricarbon heptafluoride?
C2F3
CF7
C3F7
C773

Analysis determined a compound contained 92.25% carbon and 7.75% Hydrogen. Determine the
empirical formula for this compound

In the cycle, after a new moon, _______________ means light appears on the _____________ side of the moon and continues to ________________.

Select the correct answer.

This chemical equation is not balanced:
AgBr(s) → Ag(s) + Br2(g).

Why isn’t it possible for the reaction to occur as indicated by the unbalanced equation?

A.
There are more substances on the right side of the equation than on the left side.
B.
There is a gas on the right side of the equation but not on the left side.
C.
The bromine atoms must go through a liquid state before becoming a gas.
D.
There is more mass represented on the right side of the equation than on the left side.
E.
The bromine atoms on the right side of the equation are not bonded to another element.

A cell wall is the ________.
A
thin, soft membrane that surrounds the nucleus of each cell

B
collection of cytoplasm in each cell

C
rigid structure that surrounds the cell membrane of plant cells and most bacteria

D
sheets of cells that cover the lining of the stomach

Kaitlyn said that the metal sodium Na and the non metal neon Ne form the ionic compound NaNe. Using what you know about groups and valence electrons, explain why you support or do not support kaitlyns statement

6.
This part of Earth's atmosphere blocks the sun's harmful rays.
Ozone layer
Stratosphere
Mesosphere
Troposphere

How many atoms of tin are found in 3.50 moles of tin?

What is the percent composition by mass of suifur in Na2SO?
(Molar mass of Na2SO.= 142 g/mol)

In 2011, fires in Bastrop County, Texas were the most damaging wildfires in Texas history. The fire spread through the pine trees and scorched nearly 5,700 acres of Bastrop State Park. The majority of the Houston toad’s habitat was lost, and the Lost Pines Forest was greatly affected. As ecological succession began, which of these most likely appeared in the Bastrop forest area first?
A.Shrubs and trees
B. Newly developed topsoil
C.Weeds and grasses
D.Lichens on fallen trees