#1 Atomic Structure and Ions

Front

What happens to an atom when it gains electrons?

Back

It becomes negative.

Front

How many electrons does a neutral sodium atom have if it has 11 protons?

Back

11 electrons.

Front

Which subatomic particles have equal mass?

Back

Protons and neutrons have equal mass.

Front

What does the atomic number represent in an element's symbol?

Back

The number of protons in the nucleus.

Front

Which subatomic particle is the lightest?

Back

Electrons.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.

Front

What is the charge of an electron?

Back

Negative.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.