Atomic and mass number worksheet
Refer to a periodic table (text book page 139 or an online version) to complete the table below for the first twenty elements.
Element
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Symbol
Number of
protons in
each atom
Number of
neutrons in
each atom
Number of
electrons in
each atom
What is the
atomic number
of this atom?
What is the mass
number of this
atom?
Atomic and mass number worksheet
Atoms: Who am I?
4 protons, 5 neutrons and 4 electrons
7 protons and 8 neutrons
An atomic number of 8
3 protons, 4 neutrons and 3 electrons
An atomic number of 4
5 protons with 6 neutrons
A proton and an electron