G9-SCI-L4 Structure of the Atom

What is the atomic number of an element?

• The number of protons in the nucleus
• The number of neutrons in the nucleus
• The number of electrons in the outermost shell
• The total number of protons and neutrons in the nucleus

Who discovered the electron?

• J.J. Thomson
• E. Goldstein
• Ernest Rutherford
• Niels Bohr

What is the mass number of an atom?

• The number of protons in the nucleus
• The number of neutrons in the nucleus
• The total number of protons and neutrons in the nucleus
• The number of electrons in the outermost shell

Which atomic model proposed that electrons are arranged in discrete energy levels around the nucleus?

• Dalton's model
• Thomson's model
• Rutherford's model
• Bohr's model

What is the valency of an element?

• The number of protons in the nucleus
• The number of neutrons in the nucleus
• The combining capacity of the atom
• The number of electrons in the outermost shell

What are isotopes?

• Atoms with the same atomic number but different mass numbers
• Atoms with the same atomic number and mass number
• Atoms with the same mass number but different atomic numbers
• Atoms with different atomic numbers and mass numbers

What is the maximum number of electrons that can be accommodated in the outermost shell of an atom?

• 2
• 4
• 6
• 8

Which subatomic particle has no charge?

• Proton
• Neutron
• Electron
• Nucleus

What is the combining capacity of an atom called?

• Atomic number
• Mass number
• Valency
• Nucleus

Which atomic model proposed that electrons are embedded in a positively charged sphere?

• Dalton's model
• Thomson's model
• Rutherford's model
• Bohr's model