Question

The order of filling orbital is
[ ]
1) ls, 2s, 3s, 3p, 3d, 4s, 4p
2) 1s, 2s, 2p, 3s, 3p, 3d, 4p
3) 1s, 2s, 2p, 3s, 3p, 4s, 3d
4) 4s, 3d, 3p, 3s, 2p, 2s, 1s
​

Answer 1

Answer:

hello mate

• option 3 is the correct answer

Answer 2

Answer:

option 3 ......1s,2s,2p,3s,3p,4s,3d

Explanation:

this is because of the number of electrons these subshells contain.

s sub shell has 2 electrons

p subshell has 6 electrons

d subshell has 10 electrons

and f subshell has 14 electrons ...

you will be easily able to understand this electronic configration by forming a pyramid:

1s

2s 2p

3s 3p 3d

4s 4p 4d 4f

5s 5p 5d

6s 6p

7s...

count the number of electrons to put them in electronic configration through th pyramid taking care of the amount of electrons a subshell can hold and you will find it easy enough.