Compare Elements

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

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Element comparison
Property Os Osmium La Lanthanum
Atomic Number 76 higher 57 higher
Symbol Os different La different
Name Osmium different Lanthanum different
Atomic Mass 190.2 higher 138.9055 higher
Category Transition Metals different Lanthanides different
Period 6 same value 6 same value
Group 8 higher 3 higher
Block d-Block different f-Block different
Standard State Solid same value Solid same value
Electronegativity 2.2 higher 1.1 higher
Atomic Radius 216 lower 240 lower
Ionization Energy 8.7 higher 5.577 higher
Electron Affinity 1.1 higher 0.5 higher
Oxidation States +4, +3 different +3 different
Melting Point 3306 K (3032.85 °C) higher 1191 K (917.85 °C) higher
Boiling Point 5285 K (5011.85 °C) higher 3737 K (3463.85 °C) higher
Density 22.57 higher 6.15 higher
Electron Configuration [Xe]6s2 4f14 5d6 different [Xe]6s2 5d1 different
Year Discovered 1803 different 1839 different

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