4.1

Question 1

Atomic number

Answer 1

The number of protons in an atom

Question 2

Atoms

Answer 2

The particles that make up all the materials; the smallest part of an element that can take part in a chemical reaction

Question 3

Electron configurations

Answer 3

Arrangement of electrons in the electron shells

Question 4

Electron shells

Answer 4

Also known as energy levels,the region surrounding the nucleus where electrons may be found

Question 5

Element

Answer 5

A substance composed of atoms with the same atomic number; 118 are known to exist

Question 6

Energy levels

Answer 6

Also known as electron shells, the regions surrounding he nucleus where electrons may be found

Question 7

Ground state

Answer 7

The lowest energy arrangement of an atoms electrons in energy levels(shells)

Question 8

Indirect evidence

Answer 8

Evidence that does not invoice direct observation

Question 9

Nucleus

Answer 9

Heavy core at the Centre of the atom, made of protons and neutrons