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Complete each siatement. 1. Planck determined that energy emitted as light by a heated solid occurs in discrete units, called 2. In sulfur hexafluoride, SF,6 pairs of bonding electrons are present, resulting in a molecule with a(n) shape. 3. The series of elementary steps that make up an overall reaction is called the 4. When an element is in its most stable form at 25C and 100kPa it is said to be in its 5. For the reaction represented by the equation 2HgO(s)2Hg(I)+O2(g), the rate of appearance of mercury metal is the rate of appearance of oxygen gas. 6. If the concentration of H3Ois 107mol/L, the pH will be