railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Chemical Bond and Molecular Structure

खालीलपैकी कोणता घटक एपी ब्लॉक घटक आहे?

1
मॅग्नेशियम
2
तांबे
3
बोरॉन
4
युरेनियम
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