Question

the electronic configuration of an element is : 2(k), 8(l), 5(m). predict its valency.

Answer 1

Since its valence electrons are greater than 4,
it must be a non metal.
So valency = 8 - 5 = 3

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Answer 2

The valency of the element is 3

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

Thus total number of electrons will be 2+8+5 = 15.

Valency is defined as the number of electrons gained or lost in order to achieve nearest noble gas configuration. As the nearest noble gas is argon with 18 electrons, the element with configuration of 2,8 and 5 can gain 3 electrons to achieve noble configuration of 2,8,8.

Learn more about atomic number

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