An element forms an oxide, E₂O₃, and a fluoride, EF₃.(a) Of which two groups might E be a member?

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23-08-2022
Chemistry

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An element forms an oxide, E₂O₃, and a fluoride, EF₃.(a) Of which two groups might E be a member?

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amardeeppsingh176 amardeeppsingh176 · Answer 1 · 2022-08-31T09:32:42-04:00

a) The E might belong to group 13.

As the formula of a chemical compound is derived by the cross multiplication of the valency of the atoms. As formula of the given oxide is and valency of O atom is -2, therefore valency of element E must be +3 in order to obtain E2O3.

Also, in EF3, the valency of E will be +3 because there are three atoms of fluorine who has an individual valency of -1. Thus, e will have the valency of +3.

The Group 13 is the boron group which has the following elements:

Boron
Aluminium
Gallium
Indium
Thallium

All these elements have the valency of +3.

To know more about Valency, refer to this link:

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