Praseodymium, atomic structure
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Praseodymium, atomic structure
Thorium (Th). Diagram of the nuclear composition, electron configuration, chemical data, and valence (outer electron) orbitals of an atom of thorium-232 (atomic number: 90), the most stable isotope of this element. The nucleus consists of 90 protons (red) and 142 neutrons (orange). 90 electrons (white) successively occupy available electron shells (rings). Thorium is an actinide in period 7, and the f-block of the periodic table. Actinides are soft radioactive metals. Thorium-232, which is used as a nuclear fuel, contributes a large part of the Earths internal heat. It has a half-life of 14 billion years. Its nucleus decays by emitting an alpha particle to form radium-228
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Atom Atomic Atomic Number Atomic Orbitals Atomic Radius Atomic Weight Chemical Data Chemical Properties Chemical Property Diagram Electron Configuration Electron Number Electron Shell Electronic Electrons Element Elemental Elements Energy Levels Isotope Lanthanide Level Levels Neutron Neutron Number Neutrons Nuclear Nuclear Data Nucleon Nucleons Nucleus Orbital Orbital Types Orbitals Physical Chemistry Physical Properties Physical Property Proton Number Quantum Chemistry Shell Shell Structure Shells Simple Electron Configuration Solid Solids Structural Sub Atomic Subatomic Subshell Subshells Symbol Valence Orbital Wave Function
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