Atoms Pretest

Front

Electrons move _______________ the nucleus.

Back

outside

Front

The nucleus of an atom contains protons and _________________.

Back

neutrons

Front

What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?

Back

23

Front

Each proton has a ______________ electrical charge.

Back

Positive

Front

What does the Atomic Number tell us?

Back

The number of protons in an atom

Front

What are the three main subatomic particles of an atom?

Back

Protons, Neutrons, Electrons

Front

What is the charge of a neutron?

Back

Neutral

Front

Where are electrons located in an atom?

Back

In the electron cloud, outside the nucleus.

Front

What is the mass of a proton?

Back

Approximately 1 atomic mass unit (amu).

Front

What is the mass of an electron?

Back

Approximately 1/1836 of a proton's mass.