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118 Elements and Their Symbols and Atomic Numbers: Definition, Symbol with Atomic Number118 Elements and Their Symbols and Atomic Numbers ... Here are some popular mnemonics to help you remember the first 20 elements of the periodic table: H - Hydrogen He - Helium Li - Lithium ...
Dr. Tim: So this is the periodic table and each letter on it represents a different element. We call these letters symbols ... Marie became the first woman to win a Nobel Prize.
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