metalloid, non-metal, transitional, metal and rare-earth element
The periodic tables.
Hydrogen.
Go to this website
hassium
The columns are known as groups.
no, they depend on what country your in
he made up the periodic tables
Dmitri Mendeleev.
Their atomic mass
Periodic tables are important in most scientific classes because they help understand similarity of properties and reactions of elements.
Periodic tables are important in Chemistry classes because they help understand more about protons, electrons, and neutrons of various elements.
7The Periodic Table has 7 periods and 18 groups.