Answer: Very interesting question indeed! I can try to explain this in following words
Step-by-step explanation:
Neutrons stabilize the nucleus, because they attract each other and protons , which helps offset the electrical repulsion between protons. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus.
Secondly if there is no neutrons then the electromagnetic repulsion between proton will not allow any stable nucleus . Also remember in hydrogen there is only one proton so the repulsion is not experienced hence no need of neutron.
Hope this help!!