Atoms Answers

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A blue circle labeled proton and A overlaps a pink circle labeled neutron and C. The overlap is labeled B.

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A
Is negatively charged
B
Has mass of 1 amu
C
Orbits the nucleus
D
Is positively charged
2
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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.
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 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.
5

Which part of an atom is mostly empty space?

A
nucleus
B
proton cloud
C
electron cloud
D
neutron
6

What do an electron and a neutron have in common?

A
Each particle has a mass of 1 amu.
B
Each particle exists inside an atom.
C
Each particle has an electrical charge.
D
Each particle is located in the nucleus.
7

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
8

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.
9

Which subatomic particle has the least mass?

A
electron
B
proton
C
neutron
D
the atom
10

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.

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