Question

1
All the elements in the same period have the same _____________.

Atomic number

Energy shells or orbitals

Atomic mass

Valence electrons

Answer 1

Explanation:

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.

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Answer 2

Answer:

All the elements in the same period have the same atomic number