railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) General Science Chemistry Classification of Elements and Periodicity in Properties

সর্বোচ্চ কত সংখ্যক ইলেক্ট্রন k কক্ষে সমন্বিত করা যেতে পারে? 

1
18
2
32
3
2
4
8
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