2.2 (Atom)

Question 1

Atomic Mass Unit (AMU)

Answer 1

A unit of mass used to describe atomic and molecular weights.

Question 2

Rutherford discovered all atoms have a nucleus and it is in the centre of the atom.

Democritus and Leucippus thought of what an atom might look like, they thought everything was made up of smaller particles.

Bohr discovered electrons orbit around the nucleus.

Answer 2

Dalton’s model consists of indivisible atoms. Atoms arrange in different combinations to make different compounds.

J.J Thompson discovered electrons are much smaller than atoms. Positive and negative charge balance each other out.

J.J Thompson discovered atoms weren’t totally solid and indivisible but were made up of smaller subatomic particles.

Question 3

Orbital

Answer 3

Patterns of electron density and can be represented as a wave function.

Question 4

Cathode Tube Ray

Answer 4

A high vacuum tube in which cathode rays produce a luminous image.