Save
chem
Module 2 Foundations in chemistry
atoms, ions and compunds
Save
Share
Learn
Content
Leaderboard
Learn
Created by
hannah
Visit profile
Subdecks (1)
formulae and equations
chem > Module 2 Foundations in chemistry > atoms, ions and compunds
13 cards
Cards (24)
Mass number A
The sum of the number of
protons
and
neutrons
in the nucleus: also known as
nucleon
number
Nucleon number
The number of
protons
and
neutrons
in an atom (also
mass
number)
isotopes
atoms of the same
element
with different numbers of
neutrons
and different
masses
isotopes have different number
neutrons
and same number of
protons
and
electrons
first 4 shells can have
2
,
8
,
18
,
32
electrons
The molecular formula is the number of
atoms
of each
element
in a
molecule
The empirical formula is the
simplest
whole-number
ratio
of atoms of each element in a compound
Relative molecular mass (
Mr
)
The average mass of a
molecule
compared to
1
/
12
the
mass
of one atom of
carbon
Relative formula mass (
Ar)
The average mass of
one
atom
compared to
1
/
12
the
mass
of one atom of
carbon
Electron mass is 1/
1836
of the mass of a
proton.
atomic number = number of
protons
See all 24 cards
