Atoms, Molecules, and Ions Quiz

What is the smallest unit of an element?

• Molecule

• Atom

• Ion

• Compound

The charge of a neutron is (a)  

• Positive
• Negative
• Neutral
• None

An atom that loses one or more electrons becomes a _______________ ion.

• positive

• neutral

• negative

An atom that gains one or more electrons becomes a (a)   ion.

• positive
• neutral
• negative

What is the atomic number of an element with 8 protons?

• 6

• 7

• 8

• 9

An element with 20 protons and 22 neutrons has a mass number of (a)   .

• 40
• 42
• 44
• 46

What is the charge of an ion with 10 protons and 12 electrons?

• +2

• -2

• +1

• -1

What is the charge of a proton?

• Positive

• Negative

• Neutral

• None

Match the following atomic numbers with the number of electrons in a neutral atom.

• Aluminum (Atomic number 13)

• 14

• Silicon (Atomic number 14)

• 16

• Phosphorus (Atomic number 15)

• 13

• Sulfur (Atomic number 16)

• 15

What is the atomic mass of an element with 12 protons and 12 neutrons?

• 12

• 24

• 36

• 48