state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Chemistry d And f - Block Elements

4f 6 ইলেকট্রনিক কনফিগারেশন থাকা আয়ন শনাক্ত করুন।

1
জিডি 3+
2
Sm 3+
3
Sm 2+
4
টিবি 3+
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