Atoms

Question 1

What is an atom

Answer 1

The smallest part of an element that can still be recognised as that element

Question 2

What is a molecule

Answer 2

Two or more atoms held together by covalent bonds

Question 3

What is an element

Answer 3

A substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance.

Question 4

What is a compound

Answer 4

A substance made when two or more elements are chemically bonded together

Question 5

What is a mixture

Answer 5

A substance consisting of 2 or more substances mixed together.

Question 6

Relative mass of proton, neutron and electron

Answer 6

Proton = 1, neutron = 1, electron = 0

Question 7

Electrical charge of proton, neutron and electron

Answer 7

Proton = +1, neutron = 0, electron = -1

Question 8

What did Democritus propose

Answer 8

Matter could not be divided into smaller pieces. Said that matter was made up of small particles he called them atoms.380 BC

Question 9

What did John dalton propose

Question 10

What did JJ Thomson propose

Answer 10

First scientist to show that the atom is made o& smaller things. “plum pudding model”. Thought atom was tiny negatively charged electrons in a cloud of positive charge. 1897

Question 11

What did Rutherford propose

Answer 11

Did an experiment on positively charged particles. Led him to believe that atoms mass was concentrated in the nucleus. Made the nuclear model.

Question 12

What did Neil’s Bohr propose

Answer 12

Electrons move around in specific layers o4 “shells”. Made the atoms+ bomb. Discovered that electrons are different lengths away from the nucleus.