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Elements in the same row as one other are known as periods and they share the same highest unexcited electron energy level. ... The table tells each element's atomic number and usually its atomic weight. The typical charge of an element is indicated by its group
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Before all naturally occurring elements were discovered, the periodic table was used to predict the chemical and physical properties of elements in the gaps on the table. ... Elements in the same row as one other are known as periods and they share the same highest unexcited electron energy level.