Question

how many valence electrons does the atom contain? 1s² 2s² 2p⁴

Explanation:

Step1: Identify electron - shell capacities

The 1s sub - shell can hold a maximum of 2 electrons, the 2s sub - shell can hold a maximum of 2 electrons, and the 2p sub - shell can hold a maximum of 6 electrons.

Step2: Calculate total electrons

For the electron configuration 1s²2s²2p⁴, we have 2 electrons in 1s, 2 electrons in 2s, and 4 electrons in 2p. The total number of electrons is 2 + 2+4.
2 + 2+4=8

Answer:

8