![]() ![]() Q: What is the charge of an oxide ion? How does its number of electrons compare to its number of protons?Ī: An oxide ion has a charge of -2. The Table for cations+1 differs significantly from other newly constructed Tables and from known Tables, as the d- and f-blocks are inserted into s-block and split it up for two parts. Group I ( alkali metals) carry a +1 charge, Group II (alkaline earths) carry a +2, Group VII (halogens) carry -1, and Group VIII ( noble gases) carry a 0 charge. This paper describes the construction of the Periodic Tables for cations of all elements with charges + 1, + 2, + 3 and anions with charge 1. Q: How does the iron(III) ion differ from the iron(II) ion?Ī: The iron(III) ion has a charge of +3, so it has one less electron than the iron(II) ion, which has a charge of +2. Now, you can use periodic table trends to predict the most common element charges. ![]()
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