Question

the valence electrons of representative element are?

Answer 1

Answer:

The valence of representative elements is either equal to the number of valence electrons or eight minus the number. What is the basis of their rule? The electrons present in the valence shell (outermost shell) are called valence electrons and their number determines the valency of the element.

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Answer 2

The valence electrons of the representative element are given by the number of electrons in the outermost shell of that element.

In representative elements:

• Valency is equal to the number of electrons that are either gained or lost to complete the octet. Octet means 8 electrons in the valence shell.
• valency can also be equal to 8 minus the electrons in the outermost shell (it is applied in the p-block elements).
• For example, Sodium (Na) has valency 1. In the outer shell of Na, there is 1 electron

     ⇒  Na - 2,8,1

      ⇒ Therefore valency = 1.

• For example, Nitrogen (N) has valency 3. In the outermost shell of N, there are 5 electrons.

    ⇒  N - 2,8,5

    ⇒   Therefore valency = 8-5 = 3.

Hence, outermost electrons defines the valency.