Unit 3 Practice Test -The Atom

Front

How is the number of neutrons in the nucleus of an atom calculated?

Back

Subtract the number of protons (p+) from the mass number.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus.

Front

An element with a mass number of 16, an atomic number of 8 and a charge of 2- has how many protons, neutrons and electrons respectively?

Back

Protons: 8, Neutrons: 8, Electrons: 10.

Front

What is the mass number?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

Which of the following determines the identity of an element?

Back

The identity of an element is determined by the number of protons.

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

What is the charge of a neutron?

Back

Neutrons have no charge (they are neutral).

Front

What is the relationship between mass number and atomic number?

Back

The mass number is the sum of protons and neutrons, while the atomic number is the number of protons.