Question 1

Which of the following statements about the structure of an atom is correct?

Accepted Answer

Protons and electrons have charges of the same magnitude but opposite signs.

Question 2

Which force is primarily responsible for holding the nucleus of an atom together?

Accepted Answer

Nuclear force between protons and neutrons

Question 3

If an atom has 8 protons, 8 neutrons, and 8 electrons, what is its overall charge?

Accepted Answer

Neutral

Question 4

Which of the following best describes the relative size of the nucleus compared to the entire atom?

Accepted Answer

The nucleus is about 1/1,000,000 the size of the atom.

Question 5

Which statement correctly explains why electrons remain in orbit around the nucleus?

Accepted Answer

The electrostatic force between the negatively charged electrons and positively charged protons keeps electrons in orbit.

Question 6

A neutral atom of carbon has 6 protons and 6 neutrons. If it gains an extra electron, what is the resulting charge?

Accepted Answer

Negative

Question 7

Which of the following would happen if the electrostatic force between the nucleus and electrons were suddenly removed?

Accepted Answer

Electrons would leave the atom, and the atom would become ionized.

Question 8

Which of the following is true regarding the mass of an atom?

Accepted Answer

The mass of an atom is mostly due to its protons and neutrons.

Question 9

Which of the following best describes the charge and location of a neutron?

Accepted Answer

Neutral charge, located in the nucleus

Question 10

If the number of protons in an atom changes, which of the following also changes?

Accepted Answer

The element identity

Question 11

Which of the following equations correctly represents the electrostatic force between a proton and an electron?

Accepted Answer

$$F = k \frac{q_1$ q_2$}{r^2$}$$

Question 12

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 13

Which of the following best explains why the nucleus does not fly apart despite the repulsion between protons?

Accepted Answer

The nuclear force is stronger than the electrostatic repulsion between protons.

Question 14

A certain atom has 11 protons, 12 neutrons, and 10 electrons. What is the net charge of this atom?

Accepted Answer

$$+1$$

Question 15

Which of the following is a real-world application of understanding atomic structure?

Accepted Answer

Designing medical imaging techniques such as MRI, which relies on the behavior of atomic nuclei.

Introduction to the Atom: Structure and Forces

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