Chemistry Summative Test Q1

Who is credited with the discovery of the electron?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

Which atomic model is known as the "plum pudding" model?

• Dalton's Model

• Rutherford's Model

• Thomson's Model

• Bohr's Model

Who developed the planetary model of the atom?

• Dalton

• Thomson

• Rutherford

• Schrödinger

Why was Rutherford's model of the atom needed to replace Thomson's model?

• It couldn't explain atomic mass.

• It couldn't explain the existence of protons.

• It didn't account for a central nucleus.

• It incorrectly described electron behavior.

What particle is found in the nucleus of an atom and has no charge?

• Electron

• Proton

• Neutron

• Ion

What is the charge of a proton?

• Negative

• Neutral

• Positive

• Variable

Isotopes differ in the number of:

• Protons

• Electrons

• Neutrons

• Ions

An atom with more protons than electrons is called a(n):

• Anion

• Cation

• Neutron

• Isotope

Which principle requires that electrons fill the lowest available energy levels first?

• Hund’s Rule

• Pauli Exclusion Principle

• Aufbau Principle

• Bohr's Model

Which sublevel follows the "3p" sublevel when filling orbitals?

• 3d

• 4s

• 3s

• 4p