Atomic Structure

Question 1

Name 2 characteristics of atoms proved by the gold foil experiment

Answer 1

The mass of an atom is concentrated in a nucleus
The nucleus has a positive charge

Question 2

Describe 2 features of the plum pudding model of the atom

Answer 2

Positive charge ( protons ) is spread out across the atom
Negative electrons embedded in the atom

Question 3

Describe 2 features of the Bohr ( electron shell ) model of the atom

Answer 3

Mass is concentrated in the nucleus
Electrons orbit the nucleus at specific distances

Question 4

Name the 4 main historical models of the atom in chronological order

Answer 4

Dalton
Plum pudding model
Nuclear
Electron shell ( Bohr )

Question 5

Describe 2 features of the nuclear model of the atom

Answer 5

Atoms have a positive nucleus
Electrons orbit the nucleus

Question 6

State how large the nucleus of an atom is relative to its radius

Answer 6

1/10000th the size

Question 7

State what Chadwick discovered

Answer 7

Neutron

Question 8

State the approximate radius of a typical atom

Answer 8

0.1nm

Question 9

Name the discovery that led to scientists moving from the Dalton model to the plum pudding model.

Answer 9

The discovery of the electron

Question 10

Element

Answer 10

A substance where all the particles are the same

Question 11

Atom

Answer 11

Smallest part of an element that can exist

Question 12

Molecule

Answer 12

More than one atom chemically bonded together ( same or different )

Question 13

Compound

Answer 13

2 or more different atoms chemically bonded

Question 14

Explain how compounds are formed

Answer 14

When elements react , atoms combine with other atoms to form compounds

Question 15

Isotopes

Answer 15

Atoms of the same element with a different number of neutrons