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QuangPhu
Long Answer: All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
LucianoBordoli

Answer:

The common about the elements of a period is that they have the same number of atomic orbitals.

Explanation:

The period of an element corresponds to the principal quantum number of the valence shell.

They are a total of 7 periods in the periodic table.

The periods represent the energetic levels that an atom has.

The periods are ordered in 7 horizontal rows.

For example, in the first period we have the Hydrogen (H) and the Helium (He).