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

परमाणु संख्या 10, 18, 36, 54 ________ वाले तत्व हैं।

1

हल्की धातु

2

अक्रिय गैस

3

दुर्लभ मृदा तत्त्व

4

हैलोजन

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