Compare Elements

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

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Element comparison
Property Sr Strontium Nb Niobium
Atomic Number 38 lower 41 lower
Symbol Sr different Nb different
Name Strontium different Niobium different
Atomic Mass 87.62 lower 92.9064 lower
Category Alkaline Earth Metals different Transition Metals different
Period 5 same value 5 same value
Group 2 lower 5 lower
Block s-Block different d-Block different
Standard State Solid same value Solid same value
Electronegativity 0.95 lower 1.6 lower
Atomic Radius 249 higher 207 higher
Ionization Energy 5.695 lower 6.759 lower
Electron Affinity — no data 0.893 no data
Oxidation States +2 different +5, +3 different
Melting Point 1050 K (776.85 °C) lower 2750 K (2476.85 °C) lower
Boiling Point 1655 K (1381.85 °C) lower 5017 K (4743.85 °C) lower
Density 2.64 lower 8.57 lower
Electron Configuration [Kr]5s2 different [Kr]5s1 4d4 different
Year Discovered 1790 different 1801 different

higher lower