Given the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 , identify the number of valence electrons.

9. Electrons in Atoms and the Periodic Table - Part 3 of 4

9. Electrons in Atoms and the Periodic Table / Valence Electrons of Elements (Simplified) / Problem 18

Problem 18

Given the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹, identify the number of valence electrons.

6 valence electrons

10 valence electrons

1 valence electron

2 valence electrons