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Help me understand! The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

  • Option 1)

    15,5 and 3

  • Option 2)

    16,6 and 3

  • Option 3)

    16,5 and 2

  • Option 4)

    15,6 and 2

 
Answers (1)
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P Block elements -

P block elements comprise those belonging to group 13 to 18  and together with the  S block elements are called the main group elements.Outer most configuration varies from  ns2 np1  to  ns2np6 in each period.

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The element with atomic number is phosphorus.

P=1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}

Thus, its Group number =15 or VA

valence electrons = 5

valency = 3

\therefore Option (1) is correct

 


Option 1)

15,5 and 3

Option 2)

16,6 and 3

Option 3)

16,5 and 2

Option 4)

15,6 and 2

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