Which one of the following is the correct order of the valencies of el

Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg ?

[amp_mcq option1=”Ne < Mg < N < Si" option2="Si < N < Mg < Ne" option3="Ne < N < Si < Mg" option4="Mg < Ne < N < Si" correct="option1"]

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UPSC NDA-1 – 2022

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The correct order of the valencies of elements Ne, Si, N and Mg is Ne < Mg < N < Si.

Valency is the combining capacity of an element, typically the number of electrons an atom needs to gain, lose, or share to form a chemical bond and achieve a stable electron configuration.

Neon (Ne) is a noble gas with a full outer electron shell, so its valency is generally 0. Magnesium (Mg) is in Group 2 and typically loses 2 electrons, so its valency is 2. Nitrogen (N) is in Group 15 and typically gains 3 electrons or forms 3 covalent bonds, so its valency is 3. Silicon (Si) is in Group 14 and typically forms 4 covalent bonds, so its valency is 4. Ordering these valencies (0, 2, 3, 4) gives Ne < Mg < N < Si.

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