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118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic NumberSymbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of protons ... to help you remember the first 20 elements of the periodic table: H - Hydrogen ...
The proton number (Z) of an atom is the number of protons it contains. All the atoms of a particular element have the same proton number (number of protons). The atoms of different elements have ...
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