With the exception of Helium, noble gases have ____ valence electrons.

• 2

• 4

• 6

• 8

Tags

NGSS.HS-PS1-1

Helium has____ valence electrons.

• 2

• 4

• 6

• 8

Tags

NGSS.HS-PS1-1

Noble gases are colorless gases that are extremely ______.

• rare

• unreactive

• dangerous

Noble gases are inactive because their outermost energy level is ______.

• full

• closed

• empty

Tags

NGSS.HS-PS1-1

Noble gases are called _____ because they do not combine with other elements in nature.

• rare

• unert

• inert

The noble gases are found in small amount in earth's ____.

• crust

• water

• atmosphere

• soil

Helium's atomic number is ______.

• 2

• 4

• 6

• 8

Neon's atomic number is ______.

• 4

• 6

• 8

• 10

Argon's atomic number is ______.

• 4

• 8

• 16

• 18

Krypton's atomic number is ______.

• 6

• 36

• 18

• 10