1 H Hydrogen 1.008
Most stars “burn” to produce hydrogen. It is made up of one proton and one electron. It is the most abundant and lightest chemical element on earth. Non-remnantstars are mainly composed of hydrogen in its plasma state. Hydrogen is highly reactive. Hydrogen gas is very flammable and will burn in air at a very wide range. The largest single use of hydrogen is in the production of ammonia. Ammonia is used in the production of fertilizers and as a fertilizer itself. It is also a raw material for the production of explosives. Hydrogen is found in large amounts in giant gas planets and stars, it plays a key role in powering stars through fusion reactions.
Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish. It is used as a conductor of heat and electricity, a building material, and a constituent of various metal alloys. Copper does not react with water. On strong heating, copper forms into black solid of copper oxide. Copper usually does not react with most cold, dilute acids. However, it will react with hot, concentrated sulfuric acid and can react with both dilute and concentrated nitric acid. Copper has low chemical reactivity. The average home today contains about 400 pounds of copper for electrical wiring, water pipes and appliances .