Question

What is periods and periodicity ?​

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Answer 1

Explanation:

The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group. ... A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left.

Answer 2

Answer:

Explanation:

The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.