Sub-atomic Particles

Why are atoms electrically neutral?

• They have the same number of protons and neutrons which are both found in the nucleus.

• They have the same number of protons and electrons which are both found in the nucleus.

• They have the same number of protons and electrons which are both found outside the nucleus of atoms.

• The number of protons inside the nucleus is equal to the number of electrons outside the nucleus of an atom.

Which of the subatomic particles is the lightest?

• Electrons

• Protons

• Neutrons

• Nucleus

Which of the subatomic particles makes the nucleus positive?

• Electrons

• Protons

• Neutrons

• Nucleon

He is the scientist who studied how alpha particles interact with a piece of very thin gold foil.

• Ernest Rutherford

• Eugen Goldstein

• John Dalton

• Sir William Crookes

Which statement is NOT TRUE about the nucleus of an atom?

• It is positively charged.

• It is the tiny central part of the atom.

• It consists of protons and electrons.

• It is composed of neutrons and protons.

The Cathode Ray Tube was the instrument used in the discovery of ____________________.

• Electron

• Nucleus

• Neutron

• Proton

Rutherford’s alpha scattering experiment with gold foil demonstrated the existence of what part of the atom?

• Electron

• Nucleus

• Neutron

• Proton

Which two particles would be attracted to each other?

• Electrons and protons

• Electrons and neutrons

• Protons and neutrons

• All particles are attracted to each other