What is the atomic mass of Neon?

• 10

• 20.18

• 10.18

• 30.18

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

How many electrons are in the atom pictured? 

• 1
• 2
• 3
• 0

In an atom, what is the number of protons equal to?

• The number of electrons.
• The number of neutrons.
• The number of molecules.
• The number of nuclei.

What number indicates the nucleus?

• 1
• 2
• 3
• 4

Atoms consist of parts called protons, neutrons, and___________________.

• electrons

• nutrons

• haptons

• wontons

Two or more atoms joined together are called___.

• combination

• duet

• molecule

• atomic group

What is a small particle that is the building block of matter?

• proton

• atom

• nucleus

• electron

2H₂O
How many H₂O molecules are present?

• 1
• 4
• 2
• 8