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Explain the basis for each of these limitations on the oxidation states in which certain elements...

Explain the basis for each of these limitations on the oxidation states in which certain elements appear.
a. Arsenic can often be found with a charge of+5 but never with a charge of +6.
b. Titanium could be found with either a +2 or a +4 charge but not with a +5 charge.
c. Potassium is never found naturally as a neutral element.
d. Tin can be found with a +2 or a +4 charge but not with a+5 charge

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