METALS.
1. Metals are solid at ordinary temperatures, and usually of high specific gravity.
Exceptions: Hg is liquid above -39.5 degees; Li is the lightest solid known; Na and K will float on water.
2. Metals reflect light in a way peculiar to themselves. They have what is called a metallic luster.
3. They are white or gray. Exceptions: Au, Ca, Sr are yellow; Cu is red.
4. In general they conduct heat and electricity well.
NON-METALS. 1. Non-metals are either gaseous or solid at ordinary temperatures, and of low specific gravity. Exceptions: Br is a liquid; I has the heaviest known vapor.
2. Non-metallic solids have different lusters, as glassy, resinous- silky, etc. Exceptions: I, B, and C have metallic luster.
3. Non-metals have no characteristic color.
4. They are non-conductors of heat and electricity. Exceptions: C and some others are conductors. 5. They are usually malleable and ductile.