Q. 23 B4.4( 24 Votes )

What are the atom

Answer :

[a] 3s1

Completing the electron configuration of the element as 1s2 2s2 2p6 3s1.


Number of electrons present in the atom of the element


= 2 + 2 + 6 + 1 = 11


Atomic number of the element = 11 [sodium]


[b] 2p3


Completing the electron configuration of the element as 1s2 2s2 2p3


Number of electrons present in the atom of the element = 2+ 2 + 3 = 7


Atomic number of the element = 7 [nitrogen]


[c] 3p5


Completing the electron configuration of the element as 1s2 2s2 2p6 3s2 3p5 

Number of electrons present in the atom of the element = 2 + 2 + 6+2+5 =17


Atomic number of the element = 17 [Chlorine]

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