atomic and nuclear physics

Question 1

An atom consists of a positively charged nucleus made of:

Answer 1

Positive protons
Neutral neutrons
Surrounded by negatively charged electrons which circle the nucleus

Question 2

Alpha particles

Answer 2

a form of nuclear radiation with a large positive charge.

Question 3

How big is a nucleus compared to an atom

Answer 3

The nucleus was calculated to be about 1/10,000th the size of the atom.

Question 4

The plum pudding model suggests that most of the atom is

Answer 4

positive ‘dough’.

Question 5

What was the surname of the scientist who suggested the plum pudding model?

Answer 5

J J Thomson suggested the Plum pudding model in 1897

Question 6

radius of atom

Answer 6

1 × 10-10 metres.

Question 7

Structure of a nucleus

Answer 7

a nucleus containing protons and neutrons with smaller electrons orbiting outside the nucleus.

Question 8

relative charge and relative mass of
Proton
neutron
Electron

Answer 8

Relative charge Relative mass
Proton +1 1
Neutron 0 1
Electron -1 Close to 0 (1/2,000)

Question 9

What defines what an element it

Answer 9

An element’s atomic number

Question 10

Three types of radiation

Answer 10

alpha, beta, gamma