1. Elements in the same row belong to the same .

2. Elements in the same column are members of the same .

3. Elements that have many similar properties belong to the same .

4. Generally, the atomic mass of elements as you move from left to right and

from top to bottom on the Periodic Table.

period

group

group

increases

Soft

Silvery solid

metalloid

Reacts very slowly with

oxygen

72

Review• Periodic table• Groups• 18• Elements in each group have similar

properties• Periods• 7 periods

SCIENTIST DIVIDE ALL ELEMENTS SCIENTIST DIVIDE ALL ELEMENTS INTO THREE SECTIONSINTO THREE SECTIONS

METALSMETALSSOLID AT ROOM TEMPERATURESOLID AT ROOM TEMPERATURE Except mercury Except mercury

HAVE A SILVER-GRAY COLORHAVE A SILVER-GRAY COLOR Except gold and copper Except gold and copper

GOOD CONDUCTORS OF HEAT AND GOOD CONDUCTORS OF HEAT AND ELECTRICITYELECTRICITYHAVE A METALLIC LUSTERHAVE A METALLIC LUSTERMALLEABLEMALLEABLE

NONMETALSNONMETALSFOUND IN ALL STATES OF MATTERFOUND IN ALL STATES OF MATTER

COME IN MANY COLORSCOME IN MANY COLORS

POOR CONDUCTORS OF HEAT AND ELECTRICITY POOR CONDUCTORS OF HEAT AND ELECTRICITY (INSULATORS)(INSULATORS)

NO METALLIC LUSTERNO METALLIC LUSTER

NOT MALLEABLENOT MALLEABLE

SOME HAVE STRONG ODORSSOME HAVE STRONG ODORS

METALLOIDSMETALLOIDSHAVE PROPERTIES OF BOTH METALS HAVE PROPERTIES OF BOTH METALS AND NONMETALSAND NONMETALS

SOME ARE CALLED SEMI-SOME ARE CALLED SEMI-

CONDUCTORSCONDUCTORS