1
Particles
proton number
proton
nucleon
number
2
He
4
3
neutron
7
electron
O
C
O
O2
CO2
32.0
44.0
1.1
6
C
12.0
RELATIVE
RELATIVE FORMULA MASS
RELATIVE MOLECULAR MASS
55.9 g
Ag 108g
1.2
C
H
H
C
H
general
H
C2H6
molecular
1.4
32.0 g
He
H2O
4.00g
18.0g
The mole and the avogadro constant
H
H
O2
3p
4s
4p
KC
3d
1.3
24 dm 3
mol/dm3
80% C, 20%H
48 g + 32 g
1.5
KC
KC 2
Al
Si
P
S
Cl
TRO
M
AG
N
Ar
KC
Br2
The determination of
relative atomic masses, Ar
1 mole
KC 1
Mg
Electrons: energy levels, atomic orbitals,
ionisation energy, electron affinity
2Mg(s) + O2(g)
Key:
Na
MASS
SPECTROMETRY
empirical
Copyright © UCLES 2018
3s
ELEC
C2H2n+2
CH
The calculation of empirical and
molecular formula
2p
KC
p
ET
6.022 × 10 1 Mole
Fe
2s
2.3
KC
23
Au 197g
s
1s
ATOMIC MASS
Relative masses of atoms and molecules
The nucleus of the atom
2.2
KC
ionisation energy
O
proton
number
3
Formula mass, relative atomic mass, and moles
O
A
2
He
nucleon number
Particles in the atom
2.1
x
y
Subatomic particles
Li
KC 3
KC 4
KC 5
n = cv
m
n=
Mr
KC
TITRATE UNTIL
END POINT
2MgO(s)
80 g
Reacting masses and volumes
(of solutions and gases)
KC