Atomic Structure

Question 1

First atom ideas

Answer 1

John Dalton, English, his ideas in 1808, he thought atoms were tiny hard marbles that could not be split up

Question 2

Proton

Answer 2

Found in nucleus
Mass is 1 atomic mass unit
Relative charge is +1

Question 3

Neutron

Answer 3

Found in nucleus
Mass is 1 atomic mass unit
Relative charge is 0

Question 4

Electron

Answer 4

Found outside the nucleus
Mass is 1840/1 atomic mass unit
Relative charge is -1

Question 5

Charge

Answer 5

Neutron has no charge as the electron is negative and the proton is positive

Question 6

The planetary model

Answer 6

Danish Niels Bohr 1913, electrons travel around the nucleus in fixed paths called orbits

Question 7

Atomic number

Answer 7

The atomic number of an atom is the number of protons in the nucleus of that atom

Question 8

Mass number

Answer 8

Mass number = number of protons + number of neutrons

Question 9

Number of neutrons

Answer 9

Number of neutrons = mass number - atomic number

Question 10

Atom

Answer 10

An atom is the smallest particle of an element which still retains the properties of that element