Question

How many valence electrons are in an atom with the electron configuration in example A?

Example A: 1s22s22p63s23p64s1

7
1
6
19

Answer 1

Answer:

6

Explanation:

The total number of electrons that each shell can hold is: Shell 1 - has subshell s, which has one orbital. It can therefore hold2 electrons. Shell 2 - has subshells s and p. p has 3 orbitals, so can hold 6 electrons.

Answer 2

Answer:

1

Explanation:

as the valence shell is 4 due to the mention of the 4s1 orbital

this element lies in the s block and is named as potassium

the 3p6 wont be counted as it is in the 3rd shell, while the valance is the 4 th