DECK OF CARDS. “Atoms of different kinds—that is, elements—are distinguished by their proton number or their electron number. In all, we know of some 107 different elements, from the simplest, hydrogen (1 proton), to the most complex, copernicium (112 protons). (Heavier elements 114 and 115 have been confirmed but are as yet unnamed, while claims for elements having 113, 115, and 118 remain unconfirmed.”
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