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They do, it's just such a small contribution that in practice it's usually negligible. It takes about 1800 electrons to equal the mass of one proton.

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Q: Why doesn't the electron contribute to the mass?
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What can be inferred about the mass of ang electron?

The mass of an electron is approximately 9.11 x 10^-31 kilograms, which is significantly lighter than the mass of a proton or neutron. This implies that electrons contribute minimally to the overall mass of an atom.


What part of an atom is not used in calculating the mass number?

Electrons are not used in calculating the mass number of an atom. The mass number is determined by the total number of protons and neutrons in the nucleus of the atom. Electrons have negligible mass compared to protons and neutrons.


What does the atomic mass of an electron represent?

The mass of an electron is atomic mass units is 5,485 799 090 70(16); the mass of the electron is not an atomic mass.


What is an electron's atomic mass number?

The electron has no atomic mass number. The mass of an electron is roughly 1/1800 of the mass of a proton or neutron.


What is an electron in an atom?

Electron is a negatively (-) charged particle found in a atom. Unlike proton and neutron, electron is found in orbital shells of atom, but not in nucleus. Electron are very small that is why they don't contribute to the atomic mass of a element. Electron are responsible for forming ions and take part in chemical reaction.


What did Millikan contribute to atomic theory?

He discovered that the weight of an electron is 1836 times smaller than that of a hydrogen atom (atomis mass of 1)


Which subatomic particle has the smallest mass alpha particle neutron electron proton?

among these Electron has the least mass....


What is the mass of of an electron?

Electron has a mass of about 9.10938215 × 10−31 kg.


How does the mass of an electron compared to the mass of proton?

The proton mass is about 2,000 times greater than the electron mass.


How does the mass of electron compare to the mass of the proton?

The proton mass is about 2,000 times greater than the electron mass.


How does the mass of an electron compare to the mass of proton?

The proton mass is about 2,000 times greater than the electron mass.


How does the mass of a proton compared to the mass of the electron?

The proton mass is about 2,000 times greater than the electron mass.