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The periodic table also has a special name for its vertical columns. Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.
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Answer:

the same number of electrons in their outermost shells

Explanation:

On the periodic table, elements in the same column have the same number of electrons in their outermost shells (also known as valence electrons), and hence, are said to belong to the same group.

Similarly, elements on the same row in the periodic table have the same number of atomic orbitals and are said to belong to the same period.

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