Astatine (At). Diagram of the nuclear composition,electron configuration,chemical data,and valence (outer electron) orbitals of an atom of astatine-210 (atomic number: 85),an isotope of this element. The nucleus consists of 85 protons (red) and 125 neutrons (orange). 85 electrons (white) successively occupy available electron shells (rings). Astatine is a radioactive halogen in group 17,period 6,and the p-block of the periodic table. Astatine-210,the most stable of the isotopes of astatine,has a half-life of just over 8 hours | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Clarivan, Carlos |
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