Periodic Table December 18, 2007

Mendeleev came up with the first periodic table. It was based on the atomic masses, instead of atomic numbers.

Nobel Gases Will Always Have Full Outer Shells

GROUPS ALWAYS GO UP AND DOWN PERIODS GO LEFT AND RIGHT

AS YOU GO ACCOSS GROUPS, YOU ADD ELECTRONS IN THE SAME ELECTRON SHELL.

AS YOU GO DOWN THE PERIODS, YOU ADD SHELLS OF ELECTRONS TO THE ATOM.

Metals are on the left and bottom of the chart.

Nonmetals are on the right of the chart.

Metalloids are where the two meet.

Nobel Gases are on the end, with filled shells.

The only reason these are down here, is so the table does not get too long to fit in a book, or on a wall.