Hydrogen, The lightest element. Used in fuels and to make ammonia., Helium, A very light, unreactive gas used in balloons and cooling MRI machines., Lithium, A soft, light metal used in rechargeable batteries., Beryllium, A strong, lightweight metal used in aerospace, Boron, A metalloid used in heat-resistant glass and detergents., Carbon, An essential element in all living things; found in diamonds and graphite., Nitrogen, A gas making up about 78% of air; essential for plant growth and proteins., Oxygen, A gas needed for aerobic respiration and supports combustion., Fluorine, A highly reactive gas; its compounds are used in toothpaste., Neon, An unreactive gas that glows reddish-orange in illuminated signs., Sodium, A soft, reactive metal; its compounds include table salt., Magnesium, A lightweight metal used in alloys; also essential for chlorophyll in plants., Aluminium, A lightweight, corrosion-resistant metal used in cans, foil, and aircraft., Silicon, A metalloid used in computer chips and solar panels., Phosphorus, An essential element for bones, DNA, and plant growth; used in fertilizers., Sulfur, A yellow nonmetal used to make sulfuric acid and fertilizers., Chlorine, A reactive gas used to disinfect swimming pools and drinking water., Argon, An unreactive gas used in light bulbs and welding., Potassium, A reactive metal; potassium ions help nerves and muscles function., Calcium, A metal whose compounds help form strong bones and teeth.

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