Atomic theory and Atomic structure test

Front

What are atoms of the same element with a different number of neutrons called?

Back

Isotope

Front

Which subatomic particle has a negative charge and much less mass than a proton?

Back

Electron

Front

What must be true for an atom to be neutral?

Back

The atom has the same number of protons and electrons.

Front

Which subatomic particles account for most of the mass of an atom?

Back

Protons and Neutrons.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of a neutron?

Back

No charge.

Front

What is the charge of an electron?

Back

Negative charge.

Front

What is the nucleus of an atom made of?

Back

Protons and Neutrons.

Front

What is the mass of an electron compared to a proton?

Back

Much less mass than a proton.