1

Question 0

A substance made of two or more elements chemically combined in a specific ratio or proportion

Answer 0

Compound

Question 1

A substance that cannot be broken down into any other substances by chemical or physical means

Answer 1

Element

Question 2

The combination of two or more atoms

Answer 2

Molecule

Question 3

The average mass of an atom of a particular element

Answer 3

Atomic mass

Question 4

The number of protons in an atom of an element

Answer 4

Atomic number

Question 5

The unit used to measure the mass of particles in an atom

Answer 5

Atomic mass unit

Question 6

What is the mass of one proton or one neutron

Answer 6

One amu

Question 7

The first people known to have developed the idea of atoms, many many years ago – about 440 BC.

Answer 7

The Greeks (Democritus)

Question 8

The British school teacher who, in 1802, proposed the idea of atomic theory – and tested it in a lab.

Answer 8

John Dalton

Question 9

Atoms are so small, they can only be seen with a very special type of microscope called

Answer 9

Scanning tunneling microscope