Three elements ‘ X ’, ‘ Y’ and ‘ Z’ have atomic numbers 18, 19 and 20 respectively. How…
Chemistry · Class 11 · CBSE — Structure of Atom
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
Answer
(A) 8, 9, 10
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