Question

Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?

• A. Group 8
• B. Group 2
• C. Group 18
• D. Group 10

Answer 1

The correct option is C

Group 18

The correct option is (C):

The explanation for the correct answer:

Group 18:

1. So, an actual electronic configuration is the arrangement of all the electrons in the orbitals which are present around an atomic nucleus and in a proper manner.
2. As there is an element with the electronic configuration as 2,8 which shows that the outermost shell is completely filled and it means it has a stable octet.
3. And as the elements present in Group 18 are the noble gases which have a stable electronic configuration and octet.
4. Also the outermost shell is completely filled in the elements under group 18.
5. Hence, the element given in the question would be located under Group 18 as it has a stable electronic configuration as 2,8.

The explanation for the incorrect answers:

Option (A):

Group 8:

1. This group in the periodic table consists of the transition metals
2. And here, the electronic configuration of the elements under this group is as: $(\mathrm{n}-1){\mathrm{d}}^6{\mathrm{ns}}^2$.
3. Hence, this is an incorrect option.

Option (B):

Group 2

1. This group in the periodic table consists of the elements which are the alkaline earth metals and found in the earth's crust only.
2. And here, the electronic configuration of the elements under this group is as: ${\mathrm{ns}}^{1-2}$.
3. Hence, this is an incorrect option.

Option (D):

Group 10:

1. This group in the periodic table consists of the elements which are the transition elements.
2. And here, usually the electronic configuration of the elements under this group is as: $(\mathrm{n}-1){\mathrm{d}}^8{\mathrm{ns}}^2$.
3. Hence, this is an incorrect option.

Therefore, the correct answer is( C): Group 18.