Question

Comment on position of hydrogen in the periodic table ?

Answer 1

Explanation:

Position of Hydrogen in Periodic Table -

Hydrogen is placed in Group 1 and Group 17 (Both).

Reason -

• Hydrogen is placed in Group 1 because valence electrons of Hydrogen lies in s-subshell, and all Group 1 metals have valence electrons in s-subshell.

• Hydrogen is placed in Group 17 because Hydrogen has 1 electron less than Helium (He), and All Halogens have 1 electron less than their nearest noble gas.

Since,

• Hydrogen shows similarity with elements of Group 1 as well as Group 17, Hence it is kept outside the Periodic Table.

There are three isotopes of Hydrogen -

1) Protium

2) Deuterium

3) Tritium

NOTE -

• Tritium is Radioactive.

Answer 2

Answer:

Explanation:

hydrogen has a special position in periodic table as it comes under the category of both alkali metal and halogens

                                     so it is given a special place in the left corner of periodic table