STANDARD Chemistry Electron Distribution in Shells MCQ Question
Three elements 'X', 'Y' and 'Z' have atomic numbers 18, 19 and 20 respectively. How many electrons are present in the M shells of these elements?
8, 9, 10
8, 10, 13
8, 8, 8
8, 9, 12
Correct Answer
Detailed Explanation
The M shell can hold a maximum of 18 electrons. For elements with atomic numbers 18, 19, and 20, the electron configurations are 2, 8, 8; 2, 8, 8, 1; and 2, 8, 8, 2 respectively. Thus, the number of electrons in the M shell for each is 8.
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