railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Periodic Table

परमाणु क्रमांक 2, 10, 18, 36, 54 और 86 वाले तत्व हैं :

1
हैलोजन
2
उत्कृष्ट गैस
3
उत्कृष्ट धातु
4
प्रकाश मेटास
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