Atoms Test Review

Front

What charge does a proton have?

Back

Positive

Front

What does the atomic number represent?

Back

Number of protons in an element

Front

Who discovered protons had a nucleus in the center?

Back

Rutherford

Front

Neutrons have what charge?

Back

No charge

Front

What did Democritus think about matter?

Back

Matter couldn't be divided.

Front

What is the mass of a proton compared to a neutron?

Back

Protons and neutrons have approximately the same mass.

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.

Front

What is an isotope?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic mass?

Back

The atomic mass is the weighted average mass of an element's isotopes, reflecting the relative abundance of each isotope.

Front

What did the gold foil experiment demonstrate?

Back

The gold foil experiment demonstrated that atoms have a small, dense nucleus that contains protons.