GENERAL KNOWLEDGE

Detailed explanation-1: -Most hydrogen atoms have nuclei that consist of a single proton, but a small fraction (about 0.015 percent) of the hydrogen atoms that occur in Nature have one neutron in addition to the proton in their nuclei. This “heavy hydrogen” is called deuterium and is sometimes given its own chemical symbol (D).

Detailed explanation-2: -Hydrogen (H) atoms have 1 proton. Hydrogen atoms with 1 proton and 1 electron are neutral hydrogen (1H1). Hydrogen atoms with 1 proton, 1 electron, and 1 neutron are a heavy isotope of hydrogen called deuterium (2H1). If a proton is added to hydrogen, we then have a different element-helium (4He2).

Detailed explanation-3: -A hydrogen atom that has lost its only electron is sometimes referred to as a proton. That is because once the electron is lost, all that remains is the nucleus, which in the case of hydrogen consists of only one proton.