Question

27. Neutrons are not present in the
nucleus of atoms of
(a) Hydrogen
(b) Helium
(c) Lithium
(d) None of these​

Answer 1

Answer:

all atoms have neutrons except Hydrogen because of its tiny nucleus also it only contain only 1 electron

therefore, (a) Hydrogen

Answer 2

Answer:

(a)Hydrogen

Explanation:

There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom.