Elements in the same period have the same what ?

Elements in the same period have the same number of atomic orbitals.

Explanation:

The number of orbitals depends on the row. (E.g. all elements in the top row have the same number of atomic orbitals: 1. All elements in the second row have 2 atomic orbitals for their electrons.)

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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