Question

An element X shows two valencies of 2 and 4. Write the formulae of the two oxides of this compound.

Answer 1

Answer:

XO and XO2.

Valence of oxygen is -2. So when X shows the valence as +2, the compound formed is XO.

And when the valence of X is +4, the compound formed is XO2.

Answer 2

Answer:

XO and XO2, the oxygen valence is -2. When the valence of X is +2, the compound produced is X.  When the valence of X is +4, the resulting chemical is XO2.

Explanation:

What is valence?

In chemistry, valence is the characteristic of an element that controls the number of other atoms with which an atom of that element may combine. The phrase, first used in 1868, is used to represent both the general power of combination of an element and the numerical value of the power of combination. The explanation and systematisation of valence posed a significant problem to nineteenth-century chemists. In the lack of a convincing theory of its origin, the majority of the work was directed toward developing empirical methods for calculating the valences of the components. The number of hydrogen atoms with which an atom of the element may mix or replace was used to calculate the element's characteristic valence.

To know more about valence check out:

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