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In a periodic table, what do you know about all the elements in a period, or row? A They have the same atomic number B They have the same atomic mass. C They have the same properties. D They have different
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In a periodic table, what do you know about all the elements in a period, or row? A They have the same atomic number B They have the same atomic mass. C They have the same properties. D They have different properties.

User Vlmercado
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Answer: C. They have the same properties.

Explanation: The columns, or groups, on the periodic table represent the atomic elements that have the same number of valence electrons, or those electrons in the outermost orbital shell.
User Zevero
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