Atoms and Isotopes - Paper 1

Question 1

State the approximate radius of an atom.

Answer 1

1e-10 metres

Question 2

Explain the basic structure of an atom.

Question 3

Describe the nucleus

Answer 3

The radius of a nucleus is less than 1/10 000 of the radius of an atom. Most of the mass of an atom is concentrated in the nucleus.

Question 4

Explain the arrangement of electrons in an atom.

Question 5

Which 2 particles do all atoms have equal numbers of?

Answer 5

Protons and electrons.

Question 6

Define atomic number

Question 7

Define mass number

Question 8

Describe isotopes

Answer 8

Different isotopes of an element have different numbers of neutrons.

Question 9

Explain the atom before the discovery of the electron.

Question 10

Explain the plum pudding model of the atom.

Question 11

Explain how the results of the alpha particle scattering experiment led to a change in the atomic model.

Question 12

Explain the discovery of electron energy levels.

Question 13

Explain the discovery of the proton.

Question 14

Explain the discovery of the neutron.