1. hydrogen
   helium
2. oxygen

Hydrogen is the lightest element. The symbol for hydrogen is H.

1. boron
   iron
2. helium

Helium is named for the Greek word for sun, Helios. He is the symbol for helium.

1. radium
   oxygen
2. boron

Radium is used to treat cancer. The symbol for radium is Ra.

1. oxygen
   gold
2. magnesium

Antacids often contain magnesium. The symbol for magnesium is Mg.

1. helium
   boron
2. carbon

Carbon is essential for life as we know it on earth. The symbol for carbon is C.

1. nitrogen
   boron
2. gold

Nitrogen is the most abundant element in the Earth's atmosphere. The symbol for nitrogen is N.

1. gold
   silver
2. oxygen

Oxygen is the most abundant element on Earth. The symbol for oxygen is O.

1. oxygen
   fluorine
2. helium

Compounds of fluorine are used to help prevent tooth decay. The symbol for fluorine is F.

1. potassium
   oxygen
2. gold

Eat a banana if you are deficient in potassium. The symbol for potassium is K.

1. bromine
   chlorine
2. oxygen

Bromine is used in photography. The symbol for bromine is Br.

1. gold
   iodine
2. oxygen

Iodine is added to salt to help prevent goiter. The symbol for iodine is I.

1. helium
   hydrogen
2. copper

Copper is used to make pans, plumbing and wiring. The symbol for copper is Cu.

1. gold
   silver
2. neon

Neon is the element that gives bar lights their glow. The symbol for neon is Ne.

1. argon
   silver
2. gold

Argon is denser than air. The symbol for argon is Ar.

1. krypton
   silver
2. oxygen

Krypton was the planet where Superman was born. In reality, the symbol for the element krypton is Kr.

1. radon
   oxygen
2. helium

Radon is used to treat cancer. The symbol for radon is Rn.

1. sodium
   oxygen
2. gold

Common table salt contains sodium. The symbol for sodium is Na.

1. oxygen
   calcium
2. silver

Hard water leaves a residue of calcium. The symbol for calcium is Ca.

1. gold
   boron
2. barium

A radioisotope of barium is used as a radioactive tracer in medicine. The symbol for barium is Ba.

1. chlorine
   gold
2. oxygen

Chlorine is a component of table salt. The symbol for chlorine is Cl.

1. aluminum
   boron
2. chloride

Aluminum was once more valuable than gold or silver. The symbol for aluminum is Al.

1. oxygen
   arsenic
2. helium

Arsenic is poisonous and used in pesticides. The symbol for arsenic is As.

1. tin
   oxygen
2. boron

Cans might be made of tin. The symbol for tin is Sn.

1. phosphorus
   gold
2. oxygen

Phosphorous is used in fertilizers, explosives and detergents. The symbol for phosphorus is P.

1. lead
   oxygen
2. helium

Lead was once used for plumbing. The symbol for lead is Pb.

1. helium
   boron
2. iron

Iron is both a dietary supplement and is used in construction. The symbol for iron is Fe.

1. nickel
   oxygen
2. hydrogen

Nickel was used to make coins. The symbol for nickel is Ni.

1. lithium
   gold
2. silver

Lithium forms 1+ ions in salt. The symbol for lithium is Li.

1. boron
   silver
2. helium

Silver was once commonly used to make mirror backings. The symbol for silver is Ag.

1. gold
   boron
2. silicon

Silicon is the second most abundant element in the Earth’s crust. The symbol for silicon is Si.

1. boron
   gold
2. oxygen

Boron forms the acid used in ear drops. Boron is also used as a pesticide. The symbol for boron is B.

1. gold
   helium
2. oxygen

Wedding rings are often simple bands of gold. The symbol for gold is Au.

1. mercury
   helium
2. boron

Older thermometers were made with mercury. The symbol for mercury is Hg.

1. oxygen
   platinum
2. helium

Very expensive jewelry might be made of platinum. The symbol for platinum is Pt.

1. uranium
   oxygen
2. helium

Uranium is the heaviest natural element. The symbol for uranium is U.