Structure of an Atom

Question 1

All matter is composed of atoms, which are the

Answer 1

smallest parts of an element that can take place in chemical reactions

Question 2

Atoms are mostly made up of ………. around ………..

Answer 2

empty space

a very small, dense nucleus that contains protons and neutrons

Question 3

electron relative mass

Answer 3

1/1840

Question 4

The atomic number (
) is the …………..and has symbol …

Answer 4

is the number of protons in the nucleus of an atom

Z

Question 5

The mass number (or nucleon number) is the

and has the symbol what

Answer 5

is the total number of protons and neutrons in the nucleus of an atom and has symbol A

Question 6

Protons and neutrons are also called

Answer 6

nucleons

Question 7

electron shells are called what in aqa

Answer 7

main energy levels

Question 8

principle quantum number each shell is given to see how many electrons 1st shell 1 n so how many shells are allowed 2n squared

Answer 8

2xn squared

so first shell =2

next 8

next 18

next 32