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

গ্রুপ 17 এর মৌলের নাম হল-

1
হ্যালোজেন
2
চ্যালকোজেন
3
নোবেল গ্যাস 
4
ধাতু 
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