Crash Course Atomic Theory

Who first came up with the idea that matter is composed of tiny particles?

• Leucippus and Democritus

• Antoine Lavoisier

• James Dalton

• Ernest Rutherford

What does the term 'atomos' mean?

• Small

• Divisible

• Uncuttable

• Infinite

Which model of the atom is often called the 'plum pudding model'?

• Thompson's Model

• Heisenberg's Model

• Rutherford's Model

• Bohr's Model

What did Ernest Rutherford's gold foil experiment discover?

• Protons

• The nucleus

• Electrons

• Neutrons

What fundamental particles did Rutherford's later experiments identify?

• Neutrons

• Photons

• Protons

• Electrons

Niels Bohr's model is sometimes referred to as what?

• The quantum model

• The electron shell model

• The cloud model

• The planetary model

What principle makes it impossible to know both the momentum and position of an electron?

• Planck's principle

• Bohr's principle

• Rutherford's principle

• Heisenberg's uncertainty principle

What does quantum theory propose about electrons?

• They are only particles

• They are neither particles nor waves

• They are only waves

• They have properties of both particles and waves

Tags

NGSS.HS-PS4-3

What are the regions called where an electron is most likely to be found according to modern atomic theory?

• Paths

• Orbits

• Trajectories

• Orbitals

Tags

NGSS.HS-PS1-2

Which model of the atom is often referred to as the 'cloud model'?

• Thompson's Model

• Quantum Model

• Rutherford's Model

• Bohr's Model