state gov Kolkata Police SI Mock Test 2023 General Science Chemistry Classification of Elements and Periodicity in Properties

নিম্নলিখিত কোনটি ক্লোরিনের সঠিক বৈদ্যুতিন কনফিগারেশন?

1
8, 7, 1
2
2, 8, 1
3
2, 7, 8
4
2, 8, 7
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