Atoms, elements, compounds and mixtures

Question 1

Electron

Answer 1

Negatively charged subatomic particle that exists within shells that orbit the nucleus of an atom

Question 2

Proton

Answer 2

Positively charged subatomic particle that exists within the nucleus of an atom

Question 3

Molecule

Answer 3

Two or more atoms that are chemically bonded to each other. The atoms can be the same or different from each other.

Question 4

Mass number

Answer 4

The total number of protons and neutrons in the nucleus of an atom

Question 5

Atom

Answer 5

The smallest particle of a chemical element that can exist

Question 6

Isotope

Answer 6

Atoms of the same element that have the same number of protons but different numbers of neutrons

Question 7

Atomic number

Answer 7

The number of protons in the nucleus of an atom

Question 8

Neutron

Answer 8

Neutral subatomic particle that exists within the nucleus of an atom

Question 9

Nucleus

Answer 9

The dense core in the centre of an atom that contains protons and neutrons

Question 10

Element

Answer 10

A substance made of atoms that all contain the same number of protons and cannot be split into anything simpler

Question 11

Compound

Answer 11

A pure substance made up of two or more elements chemically combined

Question 12

Mixture

Answer 12

A combination of two or more substances (elements and/or compounds) that are not chemically combined