Question

dash is a fundamental particle of atom having mass almost equal to hydrogen atom​

Answer 1

• "Fundamental particle” with “equal mass” to a hydrogen atom; it's not as easy as it sounds. If this were a multiple choice bubble sheet of a list of fundamental particles, I would pick the neutron. ... This mass was lost in the form of energy, the relation of course being defined by Einstein's famous E= mc^2.

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Answer 2

Answer:

hope this helps u

Explanation:

There are three fundamental particles which are protons, electrons and neutrons. Among them, the fundamental particle that is not present in a normal hydrogen atom is neutron.

It can also be explained as, in hydrogen, atomic number is equal to 1 and mass number = 1,

that means, hydrogen have only 1 proton only.