Compare Elements

Compare two chemical elements side by side across 19 atomic and physical properties.

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Element comparison
Property He Helium Xe Xenon
Atomic Number 2 lower 54 lower
Symbol He different Xe different
Name Helium different Xenon different
Atomic Mass 4.0026 lower 131.29 lower
Category Noble Gases same value Noble Gases same value
Period 1 lower 5 lower
Group 18 same value 18 same value
Block p-Block same value p-Block same value
Standard State Gas same value Gas same value
Electronegativity — no data 2.6 no data
Atomic Radius 140 lower 216 lower
Ionization Energy 24.587 higher 12.13 higher
Electron Affinity — no data — no data
Oxidation States 0 same value 0 same value
Melting Point 0.95 K (-272.2 °C) lower 161.36 K (-111.79 °C) lower
Boiling Point 4.22 K (-268.93 °C) lower 165.03 K (-108.12 °C) lower
Density 0.0002 lower 0.0059 lower
Electron Configuration 1s2 different [Kr]5s2 4d10 5p6 different
Year Discovered 1868 different 1898 different

higher lower