Question 1

Select the correct statement about subatomic particles.

Accepted Answer

The mass of a neutron nearly equals the mass of a proton

Answer

Electrons, protons, and neutrons all have the same mass.

Answer

Protons are positively charged and are the largest subatomic particle.

Answer

Electrons are negatively-charged and are the heaviest subatomic particle.

Question 2

The nucleus of an atom

Accepted Answer

is composed of protons and neutrons.

Answer

has no charge.

Answer

is composed of protons and electrons.

Answer

occupies a large part of the atom

Question 3

The nucleus of an atom is

Accepted Answer

positively charged and has a high density.

Answer

negatively charged and has a high density

Answer

positively charged and has a low density.

Answer

made mostly of empty space.

Question 4

All atoms are

Accepted Answer

neutral, with the number of protons equaling the number of electrons.

Answer

neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons.

Answer

positively-charged, with the number of protons exceeding the number of electrons.

Answer

negatively charged with the number of electrons exceeding the number of protons.

Question 5

An atom of an element with atomic number 50 and a mass number of 120 contains

Accepted Answer

50 protons, 50 electrons, and 70 neutrons

Answer

70 protons, 50 electrons, and 50 neutrons

Answer

120 protons, 50 electrons, and 70 neutrons

Answer

70 protons, 70 electrons, and 50 neutrons

Question 6

In which of the following is the number of neutrons correctly represented?

Accepted Answer

$_{92}^{238}	extrm{U}$ has 146 neutrons

Answer

$_{79}^{197}	extrm{Au}$ has 79 neutrons

Answer

$_{12}^{24}	extrm{Mg}$ has 24 neutrons

Answer

$_{33}^{75}	extrm{Ar}$ has 106 neutrons

Question 7

The number 14 in the name carbon-14 represents

Accepted Answer

the mass number

Answer

the atomic number

Answer

the sum of the protons and electrons

Answer

the number of protons in the nucleus

Question 8

How many protons, electrons, and neutrons does an atom of aluminum-27 contain?

Accepted Answer

13 protons, 13 electrons, and 14 neutrons

Answer

13 protons, 14 electrons, and 13 neutrons

Answer

14 protons, 13 electrons, and 13 neutrons

Answer

14 protons, 14 electrons, and 13 neutrons

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