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The fifth period has 18 elements because its filling orbitals total how many?
ANine orbitals
BSeven orbitals
CSixteen orbitals
DFour orbitals
Answer & Solution
Correct answer: A. Nine orbitals
The 5s, 4d and 5p subshells give 1 + 5 + 3 = 9 orbitals, which hold 18 electrons.
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