The atomic number on the periodic table
tells you the number of protons in the nucleus.
Potassium (K) is number 19; so a potassium
atom has 19 protons in the its nucleus.
Click on the link for the periodic table above,
then look for the potassium (K) square, click
there again, and you will get all the information
you need for this element. It works in the same
way for all the other elements in the table.
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