Which one of the following elements exhibit maximum number of valence electrons ?a)Nab)Alc)Sid)PCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The greater the valency of the element, the greater is its unreactivity. Also, the valency in a period increases from the left to the middle, then again decreases from middle to the right. So we can say that the unreactive elements are located in the center of the period. Since phosphorus and Silicon are located at the center, they have the highest number of Valence electrons, and hence are the most unreactive in the period.

Answer

On moving from left to right in a period the number of valence electrons in elements increase from 1 - 8

so phosphorus has maximum number of valence electrons that is 5

Answer

The greater the valency of the element, the greater is its unreactiveness. Also, the valency in a period increases from the left to the middle, then again decreases from middle to the right. So we can say that the unreactive elements are located in the center of the period. Since phosphorous and Silicon are located at the center, they have the highest number of Valence electrons, and hence are the most unreactive in the period

Answer

A

Answer

Na = 2,8,1

Al=2,8, 3

Si = 2,8,4

P = 2,8,5

Therefore answer is D because as you see above phosphorus has large amount of electrons in its outer shell . Therefore valency also large .

It lies under 3 period and it is lies under 15 group

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