Respuesta :
Electrons because they are negatively charged and are the heaviest subatomic particle
The atoms of an element are made of subatomic particles that include electrons, protons, neutrons, positrons, etc. The electron has the least amount of relative mass. Thus, option A is correct.
What are subatomic particles?
Subatomic particles are the smallest unit that makes a whole atom. The positively charged particle, a proton has a relative mass of 1.672 × 10⁻²⁷ kg and is the same as the neutron particle.
Though the neutrons lack any charge and are present in the nucleus with protons. The other particle called electrons is negative in charge with a relative mass of 9.1 × 10⁻³¹ Kg.
The electron is outside the nucleus in the shells. The positrons have the same mass as an electron but carry an opposite charge and act as antimatter.
Therefore, option A. the electrons have the least amount of mass in an atom.
Learn more about subatomic particles here:
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