The symbol of the element Potassium is K, its proton number is 19, its atomic mass is 39, its electron number is 19 and finally Potassium belong to period 4 of the periodic table.
This is defined as a substance cannot be further broken down by any chemical reaction and examples include oxygen, nitrogen etc.
Potassium is an element and has an atomic number of 19 with a mass number of 39 and is present in period 4 in the periodic table.
For all atoms with no charge, the atomic number is equal to the number of proton. The number of proton is also equal to the number of electron which is why they all have the same value of 19.
Neutron = atomic mass - atomic number
= 39 - 19 = 20
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