Question

what is periods?define​

Answer 1

Answer:

Arrangement of the elements. The horizontal rows of the periodic table are called periods. Each period corresponds to the successive occupation of the orbitals in a valence shell of the atom, with the long periods corresponding to the occupation of the orbitals of a d subshell.

Answer 2

Answer:

the completion of a cycle, a series of events, or a single action : conclusion. 2a(1) : an utterance from one full stop to another : sentence. (2) : a well-proportioned sentence of several clauses. (3) : periodic sentence.

Explanation:

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