Science 9

It is the negatively charged particle of the atom.

• proton

• neutron

• electron

• ion

He was known for his "raisin- bun" model of atom.

• John Dalton

• Ernest Ruterford

• J.J Thomson

• Niels Bohr

He coined the word "atomos" which means indivisible.

• John Dalton

• Erwin Schrodinger

• Democritus

• Niels Bohr

What was the famous experiment that proves the existence of protons in atoms?

• Brownian motion experiment

• Photoelectric effect

• Cathode ray tube experiment

• Gold- foil experiment

He discovered the presence of neutrons in the nucleus of atoms.

• John Dalton

• James Chadwick

• Democritus

• J.J Thomson

It is the principle that states that it is impossible to know the exact location and momentum an electron around the nucleus of an atom.

• Hund's rule

• Aufbau principle

• Heisenberg's Uncertainty principle

• Pauli Exclusion principle

He proposed that electrons move in fixed and quantized orbits.

• John Dalton

• J.J Thomson

• Niels Bohr

• Erwin Schrodinger

It is the lowest possible energy state of an electron.

• Sleeping state

• Ground state

• Excited state

• Active state

True or false: Schrodinger's model of an atom give the probability of finding an electron in a region around the nucleus of an atom.

• True

• False

According to Bohr, the 4th orbit (energy level) can contain up to ____ electrons.

• 2

• 8

• 18

• 32