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All elements in one period of the table share the same number of:

AOccupied shells
BValence electrons
CNeutron numbers
DNuclear charges
Answer & Solution
Correct answer: A. Occupied shells
1. Period members differ in outer electrons. 2. What they share is the count of shells. 3. So they share occupied shells. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._
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