Unit 5: Ions and Ionic Bonding Review Exam

How many valence electrons are in an atom of phosphorus?

• 2
• 3
• 4
• 5

How many valence electrons are in an atom of magnesium?

• 2
• 3
• 4
• 5

How many valence electrons are in a silicon atom?

• 2
• 4
• 6
• 8

What is the name given to the electrons in the highest occupied energy level of an atom?

• orbital electrons
• valence electrons
• anions
• cations

What is the electron configuration of the potassium atom? (Neutral Atom)

• 1s²2s²2p⁶3s²3p⁶4s¹

• 1s²2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²3p⁶

• 4s¹

What is the charge on the calcium ion?

• 2–

• 1–

• 1+

• 2+

What is the group number of barium in the periodic table?

• 1

• 2

• 3

• 4

What is the formula of the ion formed when potassium achieves noble-gas electron configuration? (Becomes a Cation)

• K²⁺
• K⁺
• K²⁻
• K⁻

What is the formula of the ion formed when Strontium atom loses electrons to form a compound?

• Sr²⁺
• Sr³⁺
• Sr⁺
• Sr²⁻

What is the formula of the ion formed when sulfur achieves a noble-gas electron configuration?

• S²⁺

• S³⁺

• S³⁻

• S²⁻