Atoms, elements and compounds

Question 1

Atoms

Answer 1

What everything is made of

Question 2

Diatomic

Answer 2

Elements joined in pairs

Question 3

Periodic table

Answer 3

Complete list of all elements

Question 4

Monatomic

Answer 4

When an element exists as a separate atom

Question 5

Chemical change

Answer 5

When a new substance is formed during a chemical reaction

Question 6

Oxidising agent

Answer 6

A substance that oxidises another substance and is itself reduced

Question 7

Reducing agent

Answer 7

A substance that reduces another substance and is itself oxidised

Question 8

Law of constant composition

Answer 8

Compounds are made up of fixed proportions of elements

Question 9

Exothermic

Answer 9

Chemical reaction that gives out heat

Question 10

Endothermic

Answer 10

Chemical reaction that takes in heat

Question 11

Shells

Answer 11

Where electrons are kept

Question 12

Electrons

Answer 12

Small particles around the nucleus that have a negative charge and a mass of nearly 0

Question 13

Neutrons

Answer 13

Particles in the nucleus that have no charge but a mass of 1

Question 14

Protons

Answer 14

Particles in the nucleus with a positive charge and a mass of 1

Question 15

Electrostatic force

Answer 15

Force holding together shells within an atom

Question 16

Atomic Number

Answer 16

Number of protons in the nucleus so also Number of electrons because atoms don’t have a charge

Question 17

Mass number

Answer 17

Number of neutrons and protons in an atom

Question 18

Isotopes

Answer 18

Atoms of the same element which have a different amount of neutrons in the atom