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Helium
He
Atomic Number: 2
Atomic Weight: 4.002602
Melting Point: 0.95 K
Boiling Point: 4.22 K
Specific mass: 0.0001785
Electronegativity: ?
Neon
Ne
Atomic Number: 10
Atomic Weight: 20.1797
Melting Point: 24.703 K
Boiling Point: 27.07 K
Specific mass: 0.0008999
Electronegativity: ?
Argon
Ar
Atomic Number: 18
Atomic Weight: 39.948
Melting Point: 83.96 K
Boiling Point: 87.30 K
Specific mass: 0.0017837
Electronegativity: ?
Krypton
Kr
Atomic Number: 36
Atomic Weight: 83.798
Melting Point: 115.93 K
Boiling Point: 119.93 K
Specific mass: 0.003733
Electronegativity: 3
Xenon
Xe
Atomic Number: 54
Atomic Weight: 131.293
Melting Point: 161.45 K
Boiling Point: 165.03 K
Specific mass: 0.005887
Electronegativity: 2.6
Radon
Rn
Atomic Number: 86
Atomic Weight: [222]
Melting Point: 202.15 K
Boiling Point: 211.3 K
Specific mass: 0.00973
Electronegativity: 2.2
Oganesson
Og
Atomic Number: 118
Atomic Weight: [294]
Melting Point: ? K
Boiling Point: ? 350±30 K
Specific mass: ? 13.65
Electronegativity: ?
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