Neutrons are not given directly on the Periodic Table. However the number of neutrons can be indirectly calculated.
Mass number = Number of protons + number of neutrons
12 neutrons
There are 11 protons and 12 neutrons. And that does not depend on the periodic table. Sodium had 11 protons and 12 neutrons long before the periodic table, or even human, beings existed!
Silicon
Each element on the periodic table has a specific number of neutrons and will vary for its isotope.
the periodic table
check the periodic table
Hydrogen (duterium).
1H3 and 2He4
Neutrons are sub-atomic particles. The Periodic Table is an arrangement of the elements (atoms) made from these subatomic particles. Thus Neutrons by themselves have no place in the Periodic Table. However as all elements/atoms (except Hydrogen) contain some Neutrons, it is possible to find out how many using the information presented on the Periodic Table. The number of Neutrons present in an element/atom can be determined by subtracting the atomic number of an element/atom from its atomic mass.
22
Magnesium (Mg), number 12 on the periodic table, has 12 neutrons.
A bunch of them can have 74 neutrons, this is because there are isotopes in the world.