Compare Elements

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

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Element comparison
Property Os Osmium Cs Cesium
Atomic Number 76 higher 55 higher
Symbol Os different Cs different
Name Osmium different Cesium different
Atomic Mass 190.2 higher 132.9055 higher
Category Transition Metals different Alkali Metals different
Period 6 same value 6 same value
Group 8 higher 1 higher
Block d-Block different s-Block different
Standard State Solid same value Solid same value
Electronegativity 2.2 higher 0.79 higher
Atomic Radius 216 lower 343 lower
Ionization Energy 8.7 higher 3.894 higher
Electron Affinity 1.1 higher 0.472 higher
Oxidation States +4, +3 different +1 different
Melting Point 3306 K (3032.85 °C) higher 301.59 K (28.44 °C) higher
Boiling Point 5285 K (5011.85 °C) higher 944 K (670.85 °C) higher
Density 22.57 higher 1.93 higher
Electron Configuration [Xe]6s2 4f14 5d6 different [Xe]6s1 different
Year Discovered 1803 different 1860 different

higher lower