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Common Elements
Hydrogen (H)
The simplest element
The most abundant element in the universe. Found mostly in stars.
One of the elements in water (H2O)
A major part of all living things.
Helium (He)
Second most abundant element in the universe.
Used in balloons, airships, and many scientific applications.
First observed in the Sun and later discovered on Earth
Carbon (C)
All living things are carbon based
A major part of fossil fuels
Combines with iron (Fe) to form steel
Nitrogen (N)
Most abundant gas in the atmosphere (78%)
Important part of all living things
Oxygen (O)
Second most abundant gas in the atmosphere (21%).
Major part of living things
One of the elements in water (H2O)
Makes up the majority of the Earth’s crust.
Sodium (Na)
Combines with chlorine (Cl) to form salt (NaCl)
Important part of animal diets.
Pure sodium reacts violently with water.
Silicon (Si)
Most common metalloid
2nd most abundant element in the Earth’s crust
Used in glass, ceramics, cement, and semiconductors
Also part of silicone rubbers and plastics
Phosphorus (P)
Required by all living things.
An important fertilizer.
White phosphorus will burst into flames when exposed to air and glow in the dark.
Red phosphorus is used to make matches
Sulfur (S)
Also known as “brimstone”
Important for all forms of life.
Causes onions, garlic, and skunk spray to have strong odors
Chlorine (Cl)
Combines with sodium (Na) to make salt (NaCl)
Chlorine is very poisonous to all forms of life, but small amounts are used keep drinking water safe
Chlorine is often used as a disinfectant.
Calcium (Ca)
The hard parts of animals (bones, teeth, shells, etc) usually contain lots of calcium.
Common in the Earth’s crust.
Found in limestone
Iron (Fe)
Most abundant element in the Earth’s interior
Most used metal
Combines with carbon (C) to make steel.
Combines with oxygen (O) in the air to form rust