Atoms and Molecules

The simplest unit of an element is a/an

• proton

• neutron

• electron

• atom

What is the term for the center of an atom consisting of protons and neutrons?

• nucleus

• matter

• atom

• nucleon

Which sub-atomic particle in the atom has no charge?

• Proton

• Neutron

• Electron
• Nucleus

What is the charge of an atom?

• +1

• 0

• -1

What is the charge of the nucleus in an atom?

• Positive

• Neutral

• Negative

What is the relative mass of an electron?

• 1

• +1

• 0

• 1/1840

An atom contains 20 protons. Which element is it?

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Atomic mass is the sum of the number of

• Protons and electrons

• Protons and neutrons

• Electrons and neutrons

• Protons, electrons, and neutrons

What is the electronic configuration of a carbon atom?

• 2, 4

• 2, 8, 2

• 2, 10

• 12

Isotopes are atoms of the same element with the same number of __________ but different number of ___________.

• protons, electrons

• protons, neutrons

• neutrons, protons