Atomic Structure

Question 1

Dalton

Answer 1

All elements made up of small particles called atoms

Question 2

JJ Thompson

Answer 2

Plum pudding model, stated negative electrons embedded in a positive sphere.

Question 3

Rutherford

Answer 3

Model had negative electrons orbiting a positive nucleus

Question 4

Chadwick

Answer 4

Discovered the neutron

Question 5

Present day

Answer 5

Protons and neutrons in the nucleus and electrons orbit around in shells

Question 6

Atomic number

Answer 6

This is the number of protons in an atom

Question 7

Mass number

Answer 7

This is the total number of protons and neutrons in (the nucleus of) an atom

Question 8

Isotopes

Answer 8

Isotopes are atoms which have the same number of protons (so they are atoms of the same element) but they have a different number of neutrons (so they have a different mass number).