Question

19. Name the following: (a) The element which does not contain any neutron in its nucleus. (b) An element having valency 'zero'. (c) Metal with valency 2. (d) Two atoms having the same number of protons and electrons but different number of neutrons. (e) The shell closest to the nucleus of an atom. ​

Answer 1

Answer:

(e) The shell closest to the nucleus of an atom.

Explanation:

hope it is helping

Answer 2

Answer:

(a) Hydrogen

(b) Helium,Neon,Argon,Xenon

(c) Calcium

(d) If two atoms have different numbers of protons, they are different elements. However, if two atoms have the same number of protons, but different numbers of neutrons we refer to them as isotopes.

(e) K shell

Explanation:

please give thanks in my answer

please mark me as brainlist