Subatomic Particles Practice

Front

What is the number of electrons in a neutral atom of magnesium-25?

Back

12

Front

What is the number of protons in a neutral atom of calcium-41?

Back

20

Front

What is the mass number of sodium-23?

Back

23

Front

What is the atomic number of magnesium-25?

Back

12

Front

What is the area surrounding the nucleus where electrons are found called?

Back

Electron cloud

Front

Define mass number.

Back

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

Front

Define atomic number.

Back

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

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (neutral).