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An element M has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of M is:
The correct option is (c) 14. Silicon has the electronic configuration 2,8,4. Here, the second shell contains 8 electrons, while the third shell contains 4 electrons, which is exactly half of the second shell, satisfying the given condition.
Science important questions Final Exam 2025 Class 10
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