Compare Elements

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

Swap
Element comparison
Property Rb Rubidium Zr Zirconium
Atomic Number 37 lower 40 lower
Symbol Rb different Zr different
Name Rubidium different Zirconium different
Atomic Mass 85.468 lower 91.22 lower
Category Alkali Metals different Transition Metals different
Period 5 same value 5 same value
Group 1 lower 4 lower
Block s-Block different d-Block different
Standard State Solid same value Solid same value
Electronegativity 0.82 lower 1.33 lower
Atomic Radius 303 higher 186 higher
Ionization Energy 4.177 lower 6.634 lower
Electron Affinity 0.468 higher 0.426 higher
Oxidation States +1 different +4 different
Melting Point 312.46 K (39.31 °C) lower 2128 K (1854.85 °C) lower
Boiling Point 961 K (687.85 °C) lower 4682 K (4408.85 °C) lower
Density 1.53 lower 6.52 lower
Electron Configuration [Kr]5s1 different [Kr]5s2 4d2 different
Year Discovered 1861 different 1789 different

higher lower