periodic table organization

Front

How many electrons do atoms need to be stable?

Back

Atoms need 8 electrons to be stable, following the octet rule.

Front

The periodic table of elements is organized in rows called...

Back

Periods.

Front

The group numbers (#1-18) are also equal to the number of:

Back

Valence electrons.

Front

What does 12.011 represent?

Back

Atomic mass.

Front

The yellow atoms are called...

Back

Nonmetals.

Front

What are the vertical columns in the periodic table called?

Back

Groups.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What do elements in the same group have in common?

Back

They have similar chemical properties and the same number of valence electrons.

Front

What are metalloids?

Back

Elements that have properties of both metals and nonmetals.

Front

What is the significance of the atomic mass?

Back

It represents the average mass of an element's isotopes.