Praseodymium, atomic structure
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Praseodymium, atomic structure
Krypton (Kr). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of krypton-84 (atomic number: 36), the most common isotope of this element. The nucleus consists of 36 protons (red) and 48 neutrons (orange). 36 electrons (white) occupy shells (rings); eight fill the outer (fourth) electron shell in what is a very stable configuration. The stability of an elements outer (valence) electrons determines its chemical and physical properties. Krypton is a noble gas in group 18, period 4, and the p-block of the periodic table. An inert gas found in trace amounts in the atmosphere, it is used in fluorescent lighting and lasers
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