Q. 52

Write down the ou

Answer :

Electronic configuration of group 1 elements is:

1s22s1 =Li

1s22s22p23s1 = Na


1s2 2s2 2p2 3s2 3p6 3d10 4s2 4p6 5s1=Rb

1s2 2s2 2p2 3s2 3p6 3d10 4s2 4p6 4d10 5s25p66s1=Cs

[Rn] 7s1=Fr

Number of electrons in the valence shell determine the group of an element. All these elements have one electron in their valence shell.

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