The Discovery of the Atom

Front

What is the smallest part of an atom that was first discovered?

Back

Electron

Front

Did Democritus believe that all matter was made of tiny distinct elements?

Back

True

Front

What happens during beta decay?

Back

A neutron changes to a proton and the atom becomes a new element.

Front

Who discovered the nucleus of the atom?

Back

Rutherford and his students.

Front

Does a negative ion lose an electron?

Back

False

Front

What are the three main parts of an atom?

Back

Protons, neutrons, and electrons.

Front

What charge does a proton have?

Back

Positive charge.

Front

What charge does an electron have?

Back

Negative charge.

Front

What is the center of an atom called?

Back

Nucleus.

Front

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

Back

Approximately the same.