4 2 Representative Elements Group 1 Alkali Metals Silvery in color
Fr is the most reactive in this group Tend to bond with group 17 Group 2
Alkaline Earth Metals Not as reactive as group 1 Be is found in gem stones Mg is found in chlorophyll Ca is found in bones Tends to bond with group 16 Group 13
Boron Group B is used in cookware Al is used as a substitute for steel Ga will melt in your hand Tends to bond with group 15 Group 14
Carbon Group C is found in the lead of a pencil, diamonds, all living organisms Si is found in sand, glass, computer chips Semiconductors does not conduct electricity as well as a metal, but better than a nonmetal.
Si is a semiconductor ( most metalloids are ) Group 15 Nitrogen Group N makes up 80 % of the air that we
breathe Group 16 Oxygen group O makes up about 17 % of the air
we breathe. S is used to make sulfuric acid, which is important in manufacturing many products. Se conducts electricity when exposed to light Group 17
Halogens Halogen salt former. F is the most reactive. Br is a liquid Group 18
Noble Gases They rarely combine ( bond ) with other elements. He is less dense than air Most are used in neon lights Rn is a radioactive gas that can get in homes and cause cancer
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