Atomic models

Which one of these is NOT one of Dalton's postulates?

• All matter is made tiny particles called atoms

• Atoms are indivisible and cannot be destroyed

• Atoms contain postitive and negative particles called electrons and protons

• Atoms combine in whole numbers

• Atoms of an element are identical in mass and properties and of different elements

  have different properties

What material did Rutherford bombard using alpha particles in his experiment?

• Gold foil

• Tinfoil

• aluminum foil

• iron foil

What was the limitation of the plum-pudding model?

• The atoms were too small

• The exact position of electrons in

  an atom could not be predicted.

• The atom would be unstable and radioactive according to that model

• the nucleus was too big

Which one of these is NOT one of Rutherford's conclusions?

• Lot of empty space

• A centrally located part called nucleus

• All atoms have one shell

• Nucleus is positively charged

What is Democritus' atomic model?

• A round sphere with no electrons, protons or neutrons.

• A cube with a nucleus

• A hollow pyramid

• A sphere with protons, but no electons and neutrons.

What apparatus did thompson use?

• ARDT

  (Anode Ray Discharge Tube)

• CRO

  (Cathode Ray Oscilloscope)

• Electron microscope

• CRDT

  (Cathode Ray Discharge Tube)

What sub-atomic particle did thompson discover?

• Electrons

• Protons

• Neutrons

What experiment did rutherford perform

• Aluminum foil experiment

• Litmus paper experiment

• Gold foil experiment

• Cathode ray discharge tube

What did rutherford use to track the alpha particles?

• Gold foil

• Cardboard

• Fluorescent screen

• lead screen

Cathode rays are _________________

• neutal

• positively charged

• ionised

• Negatively charged