The law that states that the repeating chemical and physical properties of elements relate to and depend on the elements' atomic numbers is _______.

Having a regular, repeating pattern is called _______.

How was Dmitri Mendeleev's periodic table organized?

  Why were there blank spaces left in Mendeleev's periodic table?

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

______arranged elements in a periodic table according to the increasing order of atomic number

Who suggested that the physical and chemical properties were related to the atomic number, rather than atomic mass?

In the modern periodic table elements are arranged by:

A __________ goes up and down on the periodic table.

A _________ goes side to side on the periodic table.

The _______ tells us how many energy shells an element has.

The _________ tells us how many valence electrons an element has.

There are_______ periods and _________ groups in the periodic table.

Where are the nonmetals located on the Periodic Table?

Where are the metals located on the Periodic Table?

Where are the metalloids located on the Periodic Table?