Yes, it is.
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No, "chums" typically refers to close friends or companions. "Periods" commonly refers to the menstrual cycle in females.
Periods in the periodic table represent the horizontal rows that classify elements based on the number of electron shells in their atomic structure. Each period corresponds to a new energy level or shell in the electron configuration of the elements.
The horizontal rows in the periodic table are called periods.
There are 18 groups and 7 periods in the periodic table. Groups indicate the number of valence electrons an element has, while periods indicate the number of electron shells an element has.
The horizontal rows are known as periods.
The horizontal rows in a periodic table are called periods. Periods represent the number of energy levels an atom's electrons occupy in an element's electron cloud.