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Which of the following correctly describes the contribution of electrons to the overall mass of an atom?

Electrons contribute significantly to the mass of an atom.

Electrons have no mass.

Electrons contribute almost all of the mass of an atom.

Electrons contribute a negligible amount to the mass of an atom.

What is the atomic number of an element defined as?

The number of protons in the nucleus of an atom.

The total number of protons and neutrons in an atom.

The number of electrons in the outermost shell.

The mass of one mole of the element.

An area where Brownian motion is exhibited is?

Smoke and dust particles in air and pollen and tiny grains floating on the surface of water.

None is correct.

Dust particles in air and tiny grains floating on a water surface.

Smoke particles in air and pollen grains floating on the surface of water.

Which of the following sub-atomic particles has no charge?

Neutrons only.

Electrons only.

Protons only.

Protons and neutrons.

What is the relative molecular mass or relative formula mass of ammonium sulphate [(NH₄)₂SO₄]?

134.

132.

130.

131.