railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Classification of Elements and Periodicity in Properties

अष्टक का नियम किस तत्व तक लागू पाया गया है?

1
कोबाल्ट
2
ऑक्सीजन
3
पोटैशियम
4
कैल्शियम
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