Atomic Theory and Atomic Structure

Front

Subatomic particles that are neutral in charge

Back

Neutrons

Front

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

Back

Nucleus

Front

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

Back

15

Front

Rutherford's 'gold-foil' experiment using alpha particle scattering concluded that

Back

most of the atom is empty

Front

What does the 6 represent?

Back

atomic number

Front

The center of an atom is called?

Back

Nucleus

Front

What are the negatively charged subatomic particles called?

Back

Electrons

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What is the charge of a proton?

Back

Positive

Front

What is the charge of an electron?

Back

Negative