Atomic Number, Atomic Mass

Front

What is the measure mainly of the nuclear particles in an atom?

Back

Mass number (the sum of protons and neutrons).

Front

If a carbon-12 atom has 6 protons, how many neutrons must be added to create a carbon-15 atom?

Back

3 Neutrons (0 Protons).

Front

How many neutrons does calcium (Ca) have if its atomic number is 20 and its mass number is 40?

Back

20 Neutrons.

Front

In the atomic symbol 24Na-2, how many electrons does this atom have?

Back

13 Electrons.

Front

What are subatomic particles with a negative charge called?

Back

Electrons.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

How do you calculate the mass number of an atom?

Back

By adding the number of protons and neutrons.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of a neutron?

Back

Neutral (no charge).

Front

What is the charge of an electron?

Back

Negative charge.