Element

An element is a pure substance that cannot be broken down by chemical means. It consists of atoms of the same type, each having the same number of protons. This number uniquely defines the element.

What is a characteristic of an element?

• It can be broken down by chemical means.

• It is a pure substance.

• It is a mixture of different substances.

• It consists of different types of atoms.

What do all atoms of an element have in common?

• They have different numbers of protons.

• They have the same atomic mass.

• They have the same number of protons.

• They have different chemical properties.

How is an element uniquely defined?

• By its chemical reactivity.

• By its atomic mass.

• By its number of neutrons.

• By its number of protons.

Which of the following is true about elements?

• They can be separated into simpler substances.

• They are defined by their number of protons.

• They have varying numbers of electrons.

• They are composed of different types of molecules.

What is the primary factor that distinguishes one element from another?

• The atomic mass.

• The number of electrons.

• The number of neutrons.

• The number of protons.