Front

Who discovered the nucleus of the atom?

Back

Rutherford

Front

What color on the periodic table represents the halogens?

Back

Red

Front

What is the number of protons in an atom called?

Back

Atomic Number

Front

What type of element is Hydrogen classified as?

Back

Nonmetal

Front

What is the force that holds the nucleus of an atom together?

Back

Nuclear Force

Front

What is the smallest unit of an element that retains its properties?

Back

Atom

Front

What is the central part of an atom called?

Back

Nucleus

Front

What are the vertical columns in the periodic table called?

Back

Groups or Families

Front

What is the term for elements that have similar properties and are in the same group?

Back

Group

Front

What is the term for the average mass of an element's isotopes?

Back

Atomic Mass