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Atomic weights are IUPAC standard values to five significant figures; bracketed values are mass numbers of the longest-lived isotope. Properties beyond element 103 are largely predicted. Everything is calculated in your browser; nothing you type is uploaded.

Elements are placed by period and group, with lanthanides and actinides in separate rows. Electron configurations follow the Aufbau order with the known exceptions such as chromium, copper and palladium.

Clicking Au shows gold: atomic number 79, 196.97 u, group 11, period 6, configuration [Xe] 4f14 5d10 6s1.