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

खालीलपैकी कोणत्या मूलद्रव्याचा अणुक्रमांक 20 आहे?

1
पोटॅशियम
2
कॅल्शियम
3
आरगॉन
4
क्लोरीन
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