Which of the following is the correct electron configuration for a neutral chlorine atom?

$1s^12s^22p^23s^33p^34s^44p^4$
$1s^22s^22p^63s^23p^34s^2$
$1s^22s^22p^63s^23p^5$
$1s^22s^22p^63s^23p^4$

Question

Which of the following is the correct electron configuration for a neutral chlorine atom?

$1s^12s^22p^23s^33p^34s^44p^4$
$1s^22s^22p^63s^23p^34s^2$
$1s^22s^22p^63s^23p^5$
$1s^22s^22p^63s^23p^4$

atlas · Answer

what is the atomic number of Chlorine?

anonymous · Answer

17

atlas · Answer

so how many electrons does it have?

anonymous · Answer

17 right?

atlas · Answer

yeah right

atlas · Answer

atomic number = number of electrons

atlas · Answer

I was taught a beautiful way of finding out the electronic configuration of any atom

atlas · Answer

Write it like this
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f and so on

atlas · Answer

and then cross them diagonally like in the attachment

atlas · Answer

The order in which the arrows pass the shells is the order in which the electrons get filled.
Remember s can hold a maximum of 2 electrons
d ->6
p->10
f->14 and so on

atlas · Answer

So the order of filling of electrons is 1s,2s, 2p,3s,3p,4s and so on
I hope you can find out now how 17 electrons will get filled up

anonymous · Answer

C $1s^22s^22p^63s^23p^5$

atlas · Answer

exactly!!

anonymous · Answer

Thanks

atlas · Answer

u are welcome