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আয়রন Atomic Number: ২৬ Atomic Weight: 55.845 Melting Point: 1808.15 K Boiling Point: 3134 K Specific mass: 7.874 g/cm3 Electronegativity: 1.83
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রুথেনিয়াম Atomic Number: ৪৪ Atomic Weight: 101.07 Melting Point: 2523.15 K Boiling Point: 4423 K Specific mass: 12.37 g/cm3 Electronegativity: 2.2
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অসমিয়াম Atomic Number: ৭৬ Atomic Weight: 190.23 Melting Point: 3300.15 K Boiling Point: 5285 K Specific mass: 22.61 g/cm3 Electronegativity: 2.2
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হ্যাসিয়াম Atomic Number: ১০৮ Atomic Weight: [269] Melting Point: ? K Boiling Point: ? K Specific mass: ? g/cm3 Electronegativity: ?
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