Pretest

Question 1

Roberto creates an animation titled “Flying through an Atom.” The animation makes it seem as if the viewer passes all the way through an atom, starting from one side, then through the atom’s center, and then leaving through the other side. What is the best description of the order of events in the animation?

Revolt · Accepted Answer

C: The viewer travels through the electron cloud, then the nucleus, and then the electron cloud again.

Question 2

Which statement describes an atomic nucleus?

Revolt · Accepted Answer

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

Question 3

What is the main difference between protons and neutrons?

Revolt · Accepted Answer

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

Question 4

How does an atom change if all of its electrons are removed?

Revolt · Accepted Answer

D: The atom becomes positively charged.

Question 5

What do an electron and a neutron have in common?

Revolt · Accepted Answer

C: Each particle exists inside an atom.

Question 6

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

Revolt · Accepted Answer

D: The atom has 7 neutrons and 8 protons.

Question 7

Which part of an atom is mostly empty space?

Revolt · Accepted Answer

D: electron cloud

Question 8

Which subatomic particle has the least mass?

Revolt · Accepted Answer

B: electron

Question 9

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

Revolt · Accepted Answer

B: The total number of protons and neutrons is 15.

Question 10

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

Revolt · Accepted Answer

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

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