Answers Reed Fall 2026 Physical Science 2nd Semester 7th HourAtoms

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What is the main difference between protons and neutrons?

Protons have a much smaller mass than neutrons.

Protons have a much larger volume than neutrons.

Protons have an electrical charge, but neutrons have no charge.

Protons make up the nucleus, but neutrons orbit around the nucleus.

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Which statement describes an atomic nucleus?

An atomic nucleus is negatively charged.

An atomic nucleus has no electrical charge.

An atomic nucleus consists of mostly empty space.

An atomic nucleus contains most of the atom’s mass.

At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line.

4 amu

6 amu

10 amu

14 amu

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.

It is very dense.

It has a large mass.

It is negatively charged.

It is where neutrons move.

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

The positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud.

The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

The negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud.

The negative charge of the protons in the nucleus equals the positive charge in the electron cloud.

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?

with “Inside the nucleus,” because the particle is a proton

with “Inside the nucleus,” because the particle is a neutron

with “Outside of the nucleus,” because the particle is a proton

with “Outside of the nucleus,” because the particle is an electron

Which subatomic particle has the least mass?

electron

proton

neutron

the atom

What do an electron and a neutron have in common?

Each particle has a mass of 1 amu.

Each particle exists inside an atom.

Each particle has an electrical charge.

Each particle is located in the nucleus.

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

There are 15 protons.

There are 15 electrons.

The total number of protons and electrons is 15.

The total number of protons and neutrons is 15.

What is the mass of a neutron?

1/2,000 amu

1 amu

2,000 amu

1/200 amu

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