(STP)

*Elements that only have unstable isotopes are listed with the mass number of the isotope that has the longest half-life in parentheses  (to indicate weight).  

Element name Atomic weight

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1000℉538℃

75℉24℃

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2800℉1538℃

At STP — standard temperature (75°F) and pressure (14.7 psia)

Periodic Table of the ElementsTap an element, group, or period for its brief description. Tap a state or category to show the elements in that state (at STP — 75°F & 14.7 psia) or category. Tap a temperature to see the change in element states.