Atomic Structure

Question 1

JJ Thomson

Answer 1

Plum pudding model
Negative electrons were embedded in a positive place
1897

Question 2

Rutherford

Answer 2

Electrons orbiting a positive nucleus
1911

Question 3

Chadwick

Answer 3

Discovered the neutron
1932

Question 4

Proton

Answer 4

Relative mass - 1
Charge - +1
Position - nucleus

Question 5

Neutron

Answer 5

Relative mass - 1
Charge - 0
Position - Nucleus

Question 6

Electron

Answer 6

Relative mass - 1/1840
Charge - -1
Position - shells orbiting nucleus

Question 7

Mass number

Answer 7

Total number of protons and neutrons in the nucleus of an atom
Top number

Question 8

Atomic number

Answer 8

Number of protons in the nucleus of an atom
Bottom number

Question 9

Element

Answer 9

A substance that consists of only one type of atom and cannot be broken into anything smaller by chemical means

Question 10

Isotope

Answer 10

Same number of protons, different number of neutrons

Question 11

Relative atomic mass calculation
Eg: a sample of boron contains 19.77% ^10B and 80.23% ^11B calculate the relative atomic mass

Answer 11

(19.77 x 10) + (80.23 x 11)
———————————— =10.8
100