1.

For boron family (B,Al,Ga,In and Tl) x : Number of elements which are solid at `40^(@)` `y` : period number of element which has greater ionization energy than element just above and below it in periodic table. ` Z`: Period number of most abundant element of group `13`. Report your answer `x+2y+3z`

Answer» Correct Answer - A::B
`x=4`
`B,Al, In` & `Tl` are solid at `40^(@)C`.Melting point for Gallium is `30^(@)C`.
`y=4`
`I.E. : B gt Al gt Ga gt In gt Tl`
`z=3`
`Al` is third most abundant element after oxygen and silicon.So it has to be most abundant element in the family.
`implies x=2y+3z=4+(2xx4)+(3xx3)=21`


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