4.1. Design for credits (LEED, other) S S/U S L S 4.2. Design for carbon footprint S S/U S L S 4.3. Design for renewable energy S L/U L/U S S 4.4. Sustainability metric tracking U L S
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Protactinium is a radioactive actinide group metal with the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission. It is a Block F, Group 3, Period 7 element.rotactiniumâs decay chain leads to actinium, and thus its chemical element name refers to Proto-actinium. The most stable and abundant isotope of Protactinium (231 Pa) has a half-life of 32,760 years and is itself produced through the decay chain of uranium (235 U).