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

2, 10, 18, 36, 54 आणि 86 अणुअंक असलेली मूलद्रव्ये सर्व            आहेत:

1
हॅलोजन
2
राज वायू
3
राज धातू
4
प्रकाश मेटा
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