BIO 150 Chapter Notes - Chapter 2: Radioactive Decay, Atomic Nucleus, Radiometric Dating

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Compound - a substance consisting of two or more different elements combined in a fixed ratio: a compound has characteristics different from those of its elements. The number of protons is always the same in all versions of a particular element: the number of protons is called the atomic number and is written in a subscript, the number of protons = # of electrons. The three dimensional space where an electron is found 90% of the time is called the orbital. Each electron shell contains electrons at a particular energy level, distributed among a specific number of orbitals of distinctive shapes and orientations: no more than 2 electrons can occupy a single orbital. The attraction of a particular atom for the electrons of a covalent bond is called its electronegativity: the more electronegative an atom is, the more strongly it pulls shared electrons toward itself.

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