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Which of the following pair of elements ...

Which of the following pair of elements belongs period of the periodic table ?

A

Mg and Sb

B

Ca and Zn

C

Na and Ca

D

Ca and Cl

Text Solution

AI Generated Solution

The correct Answer is:
To determine which pair of elements belongs to the same period in the periodic table, we need to analyze the atomic numbers of the elements and their electron configurations. The elements in the same period will have the same number of electron shells. ### Step-by-Step Solution: 1. **Identify the Atomic Numbers**: - Magnesium (Mg) has an atomic number of 12. - Calcium (Ca) has an atomic number of 20. - Zinc (Zn) has an atomic number of 30. - Antimony (Sb) has an atomic number of 51. 2. **Determine Electron Configurations**: - For Magnesium (Mg, 12): The electron configuration is 2, 8, 2 (which indicates 3 shells). - For Calcium (Ca, 20): The electron configuration is 2, 8, 8, 2 (which indicates 4 shells). - For Zinc (Zn, 30): The electron configuration is 2, 8, 18, 2 (which indicates 4 shells). - For Antimony (Sb, 51): The electron configuration is 2, 8, 18, 18, 5 (which indicates 5 shells). 3. **Count the Number of Shells**: - Magnesium: 3 shells. - Calcium: 4 shells. - Zinc: 4 shells. - Antimony: 5 shells. 4. **Identify Elements in the Same Period**: - Elements with the same number of shells belong to the same period. - Calcium and Zinc both have 4 shells, so they belong to the same period. 5. **Conclusion**: - The pair of elements that belong to the same period is Calcium (Ca) and Zinc (Zn). ### Final Answer: Calcium (Ca) and Zinc (Zn) belong to the same period of the periodic table.
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