  Question

# If an electron can have three values of spin quantum numbers (+12,0 and−12), which of the following conclusion(s) would be correct?

A
Li would be in the first period of the periodic table
B
The total number of elements in the third period would have been 27
C
Zinc (Zn) will belong to s-block in the new periodic table
D
Ga will be 1st member of d-block in new periodic table

Solution

## The correct options are A Li would be in the first period of the periodic table C Zinc (Zn) will belong to s-block in the new periodic table D Ga will be 1st member of d-block in new periodic tableThree spin values would mean that each orbital would now have 3 electrons instead of two. The number of orbitals would be the same as s=1, p=3, d=5. The number of electrons in the sub shells would be 3, 9 and 15 respectively. The new configuration would be: 1s32s32p93s33p94s33d154p95s3… (a) Li would be in the first period of the periodic table as it has 3 electrons. (b) The total number of elements in the third period would have been 12 since the 3rd period contains s and p block elements only. (c) Zinc will belong to s-block in the new periodic table with configuration 1s32s32p93s33p94s3 (d) Ga will be 1st member of d-block in new periodic table since it comes after Zn.  Suggest corrections   