Day 1 of the Periodic Table

What did Dmitri invent?

What property did Mendeleev use to organize his periodic table, at first?

Dmitri had an element named after him

True of False?

How many elements does the periodic table currently have?

(Current = 2018)

Moseley re-ordered Mendeleev's Periodic Table using _?_.

A vertical column in the periodic table is called:

A horizontal row of elements in the periodic table is called:

Periodic law states that the elements are arranged according to their atomic ________ so that elements with similar chemical properties are in the same ________ and properties repeat periodically.