Question 11 of 25 What is an equilibrium constant?
A. A constant relating the effects of activation energy and
temperature on the reaction rate
B. The value of the rate of the forward and reverse reactions at
equilibrium
O C. The ratio of equilibrium concentrations of products to
concentrations of reactants
O D. The amount of energy required for the collision of two molecules
to result in a reaction

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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