Question

Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
(b) It exists both as H⁺ and H⁻ in different chemical compounds
(c) It is the only species which has no neutrons in the nucleus
(d) Heavy water is unstable because hydrogen is substituted by its isotope deuterium

Answer 1

Deuterium: Having the atomic symbol 2H or sometimes D. It has one proton and one neutron in its nucleus, giving it the atomic mass of 2.014. It is also known as heavy hydrogen. ... Deuterium is also a stable isotope, It has the ability to form a water molecule, and such water is known as heavy water.

so "d" is incorrect

Answer 2

I think

d is incorrect

b is correct