AnswersAZ-Physical Science A-CRAtomic Theory

Elements Answers

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2 red and 2 blue overlapping balls in the center are surrounded by a green, fuzzy, circular cloud with a white line running through it. 2 green balls sit on the white line, and a line leading a bracket around the balls is labeled A. A line leading to a bracket overlapping the white line is labeled B.

Question illustration
A
It is very dense.
B
It has a large mass.
C
It is negatively charged.
D
It is where neutrons move.
2
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How does an atom change if all of its electrons are removed?

A
The atom’s volume increases.
B
The atom’s mass increases.
C
The atom becomes positively charged.
D
The atom becomes negatively charged.
3

Which statement best explains why the overall charge on an atom is zero?

A
The positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud.
B
The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.
C
The negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud.
D
The negative charge of the protons in the nucleus equals the positive charge in the electron cloud.
4

What is most likely true of an atom with a mass of 15 amu?

A
There are 15 protons.
B
There are 15 electrons.
C
The total number of protons and electrons is 15.
D
The total number of protons and neutrons is 15.
5

Students are completing a table about a particular subatomic particle that helps make up an atom.What best explains how they should complete the table?

Question illustration
A
with “Inside the nucleus,” because the particle is a proton
B
with “Inside the nucleus,” because the particle is a neutron
C
with “Outside of the nucleus,” because the particle is a proton
D
with “Outside of the nucleus,” because the particle is an electron
6

Students are completing a table about a particular subatomic particle that helps make up an atom. The students have filled in one cell of the table so far.Based on the information shown, which statement about the subatomic particle must be correct?

Question illustration
A
Its location is in the nucleus, because the particle is a proton or a neutron.
B
Its location is in the nucleus, because the particle is a neutron or an electron.
C
Its charge is +1, because the particle is a proton.
D
Its charge is 0, because the particle is a neutron.
7

Which statement describes an atomic nucleus?

A
An atomic nucleus is negatively charged.
B
An atomic nucleus has no electrical charge.
C
An atomic nucleus consists of mostly empty space.
D
An atomic nucleus contains most of the atom’s mass.
8

What is the main difference between protons and neutrons?

A
Protons have a much smaller mass than neutrons.
B
Protons have a much larger volume than neutrons.
C
Protons have an electrical charge, but neutrons have no charge.
D
Protons make up the nucleus, but neutrons orbit around the nucleus.
9

Two red and two overlapping balls in the center are surrounded by a green, fuzzy, circular cloud with a white line running through it. Two green balls sit on the white line, and a line leading a bracket around the balls is labeled A. A line leading to a bracket overlapping the white line is labeled B.

Question illustration
A
It contains most of the mass.
B
It is negatively charged.
C
It is mostly empty space.
D
It is composed of electrons.
10

Which subatomic particle has the least mass?

A
electron
B
proton
C
neutron
D
the atom

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Elements Answers — AZ-Physical Science A-CR