Valence Electrons and Oxidation Numbers

Valence electrons are found in the _______________ energy level of an atom.

• Lowest

• Highest

Tags

NGSS.HS-PS1-1

How many valence electrons does magnesium have?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

Why do atoms gain or lose electrons and form ions?

• To have no electrons

• To achieve a stable octet

• To have 2 valence electrons

• To be neutral

What charge will oxygen have when it forms an ion?

• +2

• +3

• -2

• -1

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons does nitrogen have?

• 3

• 4

• 5

• 6

Tags

NGSS.HS-PS1-1

When sodium forms an ion, what charge will it have?

• +1

• +2

• -3

• -2

Tags

NGSS.HS-PS1-1

How many valence electrons does bromine have?

• 5

• 6

• 7

• 8

Tags

NGSS.HS-PS1-1

Ions that lost electrons have a _____________ charge and ions that gained electrons have a _____________ charge.

• Negative, positive

• Neutral, negative

• Positive, negative

• Positive, neutral

How many valence electrons does sulfur have?

• 2

• 3

• 6

• 8

Tags

NGSS.HS-PS1-1

How many valence electrons does lithium have?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1