PERIODIC TABLE-ATOM Gen Info Rev

Front

What is the most common element in the universe?

Back

Hydrogen

Front

What are the vertical columns in the Periodic Table called?

Back

Groups

Front

What is the most common element in Earth's atmosphere?

Back

Nitrogen

Front

What does the number 6 represent in the Periodic Table?

Back

Atomic number

Front

Which direction on the Periodic Table indicates highly reactive metals?

Back

To the left, to the bottom

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the chemical symbol for oxygen?

Back

O

Front

What is the atomic mass of an element?

Back

The weighted average mass of an element's isotopes.

Front

What are periods in the Periodic Table?

Back

Horizontal rows of elements.

Front

What is a chemical symbol?

Back

A one or two-letter representation of an element.