You can find magnesium in group 2 period 3. magnesium is a solid and looks like a silver medal. Magnesium was originally discovered in 1755 by Joseph black. Joseph black was born on 16 April 1728 in the Bordeaux, France. He was one of 12 children. at the age of 12 he was sent to school then later got His medical degree in 1754. Joseph black died in Edinburgh, Scotland on December 6, 1799. magnesium is used in lots of items. it is used in white light, firework sparklers, flares and flash photography. …show more content…
chloride is found in group 17 period 3. Chloride is a gas with looks like a yellow-green gas. Chloride is very toxic to humans. chloride was used in the world war one. they used it as a smoke boom. Carl Wilhelm Scheele was born on December 9, 1742, at Stralsund in Sweden. Carl was one of eleven children. when Carl was 14 he became a pharmacist in Gothenburg. Chloride was discovered in 1774 by Carl Wilhelm Scheele, who thought it contained oxygen. Chlorine is commonly used to make water clean and also clean swimming