# How do you write the noble-gas electron configuration for copper?

Sep 30, 2016

(Ar)3${d}^{10}$4${s}^{1}$ = Copper

#### Explanation:

to write E.C. easily, first thing you need to do is to find the atomic number for an element (ex.Gallium[Ga])
[=]
[1]
Ga has atomic number of 31.
[2]
find a noble gas that is lower than Ga. so Argon(Ar)
Note_All noble gas have complete last electronic config.

[3] -subtract the atomic number of Gallium to Argon

Atomic number:Ga - Ar/31 -18 = 13
[4]
add 13 to the electronic configuration of Argon
(Ar)3d^10 4s^2 4p^1

s<2
p<6
d<10
f<14