Match the number of valence electrons an atom has to the charge (oxidation state) it would have when it forms an lon. (Hint: Not all the possible lonic charges will be used) Column A Column B 1. 1 Valence Electron a. 1 5 Valence Electrons b. 3 2. C. -3 3. 6 Valence Electrons, d. -1 e. -2 +2

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Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.