Quiz on Atomic Structure

Who proposed the planetary model of the atom?

• Ernest Rutherford

• Niels Bohr

• J.J. Thomson

• James Chadwick

Who discovered the existence of neutrons?

• Ernest Rutherford

• Niels Bohr

• J.J. Thomson

• James Chadwick

What is the atomic number of an atom?

• The number of protons in the nucleus

• The number of electrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of electrons in the atom

Which subatomic particle has a positive charge?

• Electron

• Proton

• Neutron

• Nucleus

Which of the following is NOT a fundamental particle?

• Quark

• Lepton

• Photon

• Neutrino

What is the charge of an atom that has gained two electrons?

• -1

• -2

• +1

• +2

Which of the following best describes the electron cloud model?

• Electrons are arranged in discrete energy levels around the nucleus.

• Electrons are located in specific orbits around the nucleus.

• Electrons are spread out in a cloud-like region around the nucleus.

• Electrons are confined to specific regions within the nucleus.

What is the approximate mass of an electron?

• 1 atomic mass unit (amu)

• 1/2 atomic mass unit (amu)

• 1/1836 atomic mass unit (amu)

• 1836 atomic mass units (amu)

What is an isotope?

• An atom with a different number of neutrons

• An atom with a different number of protons

• An atom with a different number of electrons

• An atom with a different number of energy levels

What is the maximum number of electrons that can occupy the first energy level of an atom?

• 2

• 4

• 8

• 16