Quiz #1

Bonus Question: Write your full name and age.

Who first proposed the idea that matter is composed of indivisible particles called atoms?

• John Dalton

• J.J Thomson

• Democritus

• Ernest Rutherford

Which scientist proposed the first modern atomic theory based on experimental evidence?

• John Dalton

• J.J. Thomson

• Niels Bohr

• Erwin Schrödinger

J.J. Thomson’s discovery of the electron led to which atomic model?

• Plum pudding model

• Nuclear model

• Planetary model

• Quantum mechanical model

What experiment did J.J. Thomson conduct to discover the electron?

• Gold foil experiment

• • Cathode ray tube experiment

• Oil drop experiment

• Double-slit experiment

Rutherford’s gold foil experiment led to the discovery of:

• Electrons

• The nucleus

• Neutrons

• Atomic orbitals

Why did Rutherford conclude that the atom is mostly empty space?

• Most alpha particles passed through the gold foil

• Some alpha particles were deflected

• The gold foil emitted light

• Alpha particles lost energy upon impact

Niels Bohr proposed that:

• Electrons move randomly in an atom

• Electrons orbit the nucleus in fixed energy levels

• The atom is indivisible

• Protons and neutrons move in orbitals

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Photon

Where are neutrons located in an atom?

• In the electron cloud

• In the nucleus

• Orbiting the nucleus

• In energy levels