![]() Find out the number of protons for each element by looking at the proton number of each element on the Periodic Table. Calcium has the proton number 20 and thus there are 20 protons in the nucleus of each calcium atom.If you find a calcium atom with more or less than 20 protons in the nucleus, then you are wrong and what you have before you is not calcium.Elements are defined and distinguished by the number of protons. Lithium is proton number 3 and all lithium atoms have three protons per nucleus. Hydrogen is proton number 1 and all hydrogen atoms have one proton per nucleus.Helium is proton number 2 and all helium atoms have two protons per nucleus. ![]() The elements are defined by their number of protons.There are about 118 known elements (see the Periodic Table of the Elements) and all have a different number of protons.The number of protons is indicated on the Periodic Table by the proton number or atomic number. Student Program will allow the students the opportunity to travel to Greece, the U.K.How do the number of protons identify an atom?
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