Elements & The Periodic Table

Front

What are the rows in the Periodic Table called?

Back

Periods

Front

Why do theories in Atomic Theory change?

Back

New evidence is found that allows the theory to be changed.

Front

What charge do protons have?

Back

Positive

Front

What charge do neutrons have?

Back

Neutral

Front

What charge do electrons have?

Back

Negative

Front

What does the number at the top of an element box represent?

Back

Atomic number

Front

How can you find the number of neutrons in an atom?

Back

Subtract the atomic number from the atomic mass.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the atomic mass of an element?

Back

The weighted average mass of an element's isotopes.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances.