# Question #2e9c4

##### 1 Answer

Number of Period = Row number in table, so it concerns Li to Ne...

**4 Quantum numbers:**

n = Principal number (basically row number);

m = Magnetic number;

s = Spin number.

**Maximum values:**

n = 1,2,3,4,5 etc. (remember, this is the row number)

m ranges from

If **n** =1 (row 1) then ** #l#** can only be 0. (n-1 = 1-1 = 0)

If

**m**can only be 0. (

s is always either -1/2 or +1/2

This describes the

**-orbital, with max. 2**#1S#

If n=2, then

Once again:

If **m** can only be 0. (

s is always either -1/2 or +1/2

since n=2, this describes the ** #2S#**-orbital, with max. 2

If however **m** can be

** #P#**-orbital, or rather set of:

m=-1:

m=0:

m=+1:

Therefore, in period 2 there are 4 orbitals:

2 electrons in each orbital:

The

Hence the two