Question

The electron configuration of an element is 1s22s1. How many valence electrons does the element have?

1
2
3
4

Answer 1

Hello Skyyy. First things first. Do you know how to calculate the valence electrons in a electron configuration?

Answer 2

Sky?

Answer 3

berly

Answer 4

Do you have a periodic table skyyy

Answer 5

berly

Answer 6

yes

Answer 7

i mean

Answer 8

Alright, do you see above the elements on each column? Are they labeled 1-18?

Answer 9

yes

Answer 10

Group 1: 1 valence electron
Group 2: 2 valence electrons
Group 13: 3 valence electrons
Group 14: 4 valence electrons
Group 15: 5 valence electrons
Group 16: 6 valence electrons
Group 17: 7 valence electrons
Group 18: 8 valence electrons (except for helium, which has 2)

Answer 11

Does this help?

Answer 12

alittle
yeah

Answer 13

thxs

Answer 14

Mhm :D

Answer 15

got snapchat

Answer 16

No I do not. Why?

Answer 17

nothing just asking

Answer 18

Thank you love @ThisGirlPretty

Answer 19

Anytime sir :D, good job!

Answer 20

:D