1.

The number of valence electrons in the valece shells , 1 , 2 , 3of theX , Y , Z elements are 2 , 8 , 6 respectively . Identify the element which doesn ' t exist monoatomic state.

Answer»

X
Z
Y
XandY

Solution :`{:(" Element",X,Y,Z),("VALENCE shell",underset((1))(K),underset((2))(L),underset((3))(M)):}`
No . Of valence
`{:("Electrons",2,8,6),("Element","He","Ne","S"):}`
SULPHUR doesn ' t exist in monoatomicstate due to its greater chemical REACTIVELY.


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