railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry States of Matter

10, 18, 36, 54 अणुअंक असलेले घटक आहेत

1
हलके धातू
2
निष्क्रिय वायू
3
दुर्मिळ मृदा तत्व 
4
हॅलोजन
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