symbols, atomic numbers, atomic mass, chemical groups (families), and periods are identified on the periodic table; and
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Elements can be represented by chemical symbols.
explain that elements are represented by symbols.
The atoms of one element differ from those of another element in the number of protons.
A limited number of elements, including silicon, aluminum, iron, sodium, calcium, potassium, magnesium, hydrogen, oxygen, nitrogen, and carbon, form the largest portion of Earth’s crust, living matter, the oceans, and the atmosphere.
elements may be represented by chemical symbols;