Question

Name of the element having smallest atomic mass

Answer 1

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Here is your answer

The element having smallest atomic mass is Hydrogen.

Symbol =>H

Atomic mass=>1

Atomic number =>1

Answer 2

Atomic size is the distance between outermost shell and nucleus of an atom.

Atomic size decreases across periods and increases down the group in a peroidic table.

As at. size decreses atomic no i,e. nuclear charge increases.Helium has at no 2 .It has smallest atomic size.It is smaller than Hydrogen bcoz the nuclear charge is greater, and the 2 electrons occupy the same orbital as does the single electron in the hydrogen because the nuclear charge is greater, and the 2 electrons occupy the same orbital as does the single electron in the hydrogen atom.

So answer is Helium(He)