Question

Give the name of following:
(i) The element which has no neutron in its nucleus.
(ii) Element with ‘Zero’ valency
(iii) Metal with Valency 1
(iv) Two atoms with same number of electrons & protons but with different number of neutrons.

Answer 1

The names of the below questions are as follows:

1) Hydrogen has no neutrons in its nucleus because the hydrogen element has only one proton.

2) Halogens such as Argon, Neon, krypton, Helium, these elements have zero valency because there are no electrons in their outer shell.

3) Alkali metals have only one valence electrons in their outermost cell.

4) Isotopes have the same number of electrons and protons but a different number of neutrons.

Answer 2

Answer:

i)Protium 1st isotope of hydrogen

Ii) All noble gases which comes in 18th group like He Ne Ar Kr Xe Rn .

III)Li or Lithium because it's energy level is 2,1 since it's valency is 1

IV) Deuterium and tritium isotopes of hydrogen both have 1 and 2 neutrons