SSC MTS 2022 PYQ — Question 34

The correct answer is Option 1 i.e. 1

In Mendeleev's periodic table total number of periods are seven and total number of groups are nine.Hydrogen is the first element so its atomic number is one, which means it has only one electron in its atom and thus only one electron is present in its outermost shell.

Additional Information-

Hydrogen in the periodic table belong to group 1 of alkali metals having same valence shell but it possessed characteristics that resemble with  alkali metals and the halogens.
So, it was placed in group IA as well as in group VIIA because it form poitive ion as in HCL and also negative ion as NAH and could not be given a fixed position in Mendeleev’s Periodic Table.