Question

one period consists of ____ ,____and​

Answer 1

Answer:

There are seven periods in the periodic table. Each period consists of a series of elements having same valence shell. Each period corresponds to a particular principal quantum number of the valence shell present in it.

There are eighteen groups. Group consists of a series of elements having similar valence shell electronic configuration.

An element with three electron shells and two electrons in its valence shell belongs to period 3 and group 2.

Explanation:

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Answer 2

Answer:

Take the answer and write it