Atomic Structure

Front

What is the mass number of an atom?

Back

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

Front

What are subatomic particles with a negative charge called?

Back

Electrons.

Front

How many electrons must an atom have if it has 12 positively charged subatomic particles to be neutral?

Back

12 electrons.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons does indium have?

Back

Indium has 49 protons.

Front

What are subatomic particles that are neutral in charge called?

Back

Neutrons.

Front

What is the charge of protons?

Back

Protons have a positive charge.

Front

What is the charge of neutrons?

Back

Neutrons have no charge (they are neutral).

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.