Periodic Table

• Elements are arrange into rows by increasing ATOMIC NUMBER

• The horizontal rows are called PERIODS and are labeled from 1 to 7.

• The vertical columns are called GROUPS are labeled from 1 to 8 (or I to VIII)

• Elements in the same group tend to have similar properties and act in similar ways in reactions

Alkali metals

Group 1• Have 1 electron in the outer

shell• Very reactive metals• In nature, are always found

in compounds – like salt.• Very soft• Shiny, silver

ALKALINE EARTH METALSGroup 2• 2 electrons in

the outer shell• Metals• White, silvery,

and malleable

Transition metals

We are not going to learn about these elements in this course

HalogensGroup 7• 7 electrons in

the outer shell• Non-metals• Very reactive -

are often bonded with Group 1 Alkali Metals

Noble GasesGroup 8Full outer shell

=8 electronsNon-metalsExist as gasesNot reactive

with other elements

Green squares are metalloids

Non-metalsMetals