Question

Q.4. Which subatomic particles of an atom are responsible for Atomic mass ?
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Answer 1

Answer:

Together, the number of protons and the number of neutrons determine an element's mass number. Since an element's isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.

Explanation:

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Answer 2

Answer:

Atoms are made up of particles called protons, neutrons, and electrons, which are responsible for the mass and charge of atoms.

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number.Most of the mass comes from protons and neutrons. For example, a hydrogen atom is 1.6736•10^-27 kg, of which its proton makes up 1.6726•10^-27 kg. Most of the rest is the electrons, which are about 0.1% as big as the protons. The remainder is the kinetic energy of these particles, and of the photons that carry the electromagnetic binding of the electrons, and the mass and kinetic energy of the pions and other mesons that carry the nuclear binding of the protons and neutrons.