BIOL 1107 Lecture Notes - Lecture 2: Weak Interaction, Chemical Formula, The Strongest

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Concept 2. 2 an element"s properties depend on the structure of its atoms: each element consists of unique atoms. 14c is one of these unstable isotopes, or radioactive isotopes: when 14c decays, one of its neutrons is converted to a proton and an electron. If two atoms come close enough that their unshared orbitals overlap, they can share their newly paired electrons. These atoms form a double covalent bond (o=o): every atom has a characteristic total number of covalent bonds that it can form, equal to the number of unpaired electrons in the outermost shell. This satisfies the valences of both elements: methane (ch4) is a compound that satisfies the valences of both c and h, atoms differ in the degree of their attraction for shared electrons. An example is nacl, or table salt: the formula for an ionic compound indicates the ratio of elements in a crystal of that salt.

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