For each ionic compound formula, identify the main group to which X belongs: (a) CaX2;

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23-08-2022
Chemistry

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For each ionic compound formula, identify the main group to which X belongs: (a) CaX2;

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rafikiedu08 rafikiedu08 · Answer 1 · 2022-08-30T09:43:40+02:00

For each ionic compound formula, identify the main group to Ca is in group 2, so it exists in salts as a (2+) ion. Since it takes 2 X to balance this, each X must have a charge of 1-. This means moving one column to the left of the noble gases, so X belongs to group 17 (or VIIA) - the column containing F, Cl, Br, I, and At.

Group17 (VIIA) is the primary group to which X belongs in each ionic combination with the formula CaX2. X is undoubtedly an electron acceptor. It is capable of taking an electron. We determine that X must be in the oxidation state -1 by looking at the chemical formula. The neutral ionic compound's total number of oxidation states is zero. Since calcium has an oxidation state of +2, we must identify the element that contains an anion with an oxidation state of -1. The halogens have a strong propensity to pick up an electron and create an anion. X belongs to group17 (VIIA) as a result.

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