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What is an element?

• A substance that cannot be broken down

  into simpler materials by ordinary means.

• A substance that is a good conductor of

  heat and electricity.

• The basic unit of matter.

• A substance made from two or more

  simpler substances.

What do protons and electrons have that

neutrons do not?

• mass

• charge

• weight

• volume

What elements are the most abundant in

Earth’s atmosphere?

• water and air

• nitrogen and oxygen

• silicon and aluminum

• carbon dioxide and oxygen

How is the element carbon different from the

element nitrogen?

• Carbon has a negative charge.

• Nitrogen has a negative charge.

• They have different numbers of protons.

• Carbon can be broken down into simpler

  substances.

Metals all share certain physical properties.

Which property do most metals share?

• brittle

• malleable

• poor conductor of heat and electricity

• low boiling point