Lesson 6- The Periodic Table

PERIODIC TABLE - an organizational system for elements. Elements are arranged in rows going from right to left called Periods and columns going up and down called Families or Groups .
Elements in the same period have the same number of energy levels.

The period number is the same as the number of energy levels

Atoms get more massive as you move from left to right across the periodic table
The atomic radii decreases as you move left to right across the periodic table

Elements in the same family / group have similar properties because they have a similar electron arrangement.

Metals are on the left hand side of the table

Non-metals are on the right-hand side of the table.

Metalloids are between the metals and non-metals.

Group I or Alkali metals - Elements whose atoms have 1 outer-shell electron; they are very reactive
Group II or Alkaline Earth Metals - Elements whose atoms have 2 outer-shell electrons
Group III - Elements whose atoms have 3 outer-shell electrons
Group IV - Elements whose atoms have 4 outer-shell electrons
Group V - Elements whose atoms have 5 outer-shell electrons Group VI - Elements whose atoms have 6 outer-shell electrons
Group VII or Halogens - Elements whose atoms have 7 outer-shell electrons
Group 0, sometimes called group 8 or Noble Gases - Elements whose atoms have full outer shells so they are very unreactive.