💡 L3.3 Mastery Check: Electron Configuration

N (1s² 2s² 2p³) has ________ valence electrons.

• 3
• 5
• 2
• 8

Cl (1s² 2s² 2p⁶ 3s² 3p⁵) has ________ valence electrons.

• 5
• 7
• 8
• 6

Sr (1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²) has ________ valence electrons.

• 1
• 2
• 3
• 4

Mn (1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵) has ________ valence electrons.

• 2
• 5
• 7
• 10

Ne (1s² 2s² 2p⁶ 3s² 3p⁶) has ________ valence electrons.

• 2

• 8

• 10

• 6

Na (1s² 2s² 2p⁶ 3s¹) has ________ valence electrons.

• 1

• 2

• 3

• 4

Cl (1s² 2s² 2p⁶ 3s² 3p⁵) has ________ valence electrons.

• 5

• 6

• 7

• 8

O (1s² 2s² 2p⁴) has ________ valence electrons.

• 2

• 4

• 6

• 8

Fe (1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶) has ________ valence electrons.

• 2

• 4

• 6

• 8

Ar (1s² 2s² 2p⁶ 3s² 3p⁶) has ________ valence electrons.

• 2

• 8

• 10

• 6