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5 April, 04:50

Magnesium reacts with a certain element to form a compound with the general formula MgX. What would the most likely formula be for the compound formed between potassium and element X?

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  1. 5 April, 05:14
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    K2X

    Explanation:

    Valency can be defined as the combining power of an element. It is the valency that dictates the value an element will have when writing a chemical formula for its compound.

    MgX is a compound of magnesium and an element X. The valency of magnesium in most of its compound is + 2. Now for the 2 to have been absent in the chemical formula, this shows that the element X itself have a valency if - 2 for the valencies of both to have canceled out.

    Now considering the element potassium, it is an alkaline metal belonging to group 1 of the periodic table. Hence, it is expected that it has a valency of + 1

    Forming a compound with element X means there would be an exchange of valencies between the two. We have established that x has a valency of - 2. The formula of the compound thus formed by exchanging the valencies of both element would be K2X
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