1.

If A, B, C and D are element's of 3^(rd) period of p-block in modern Periodic Table. Among these 'A' is a metal, 'B' is metalloid and 'C', 'D' are non metals and their order of electronegativity is given as rarr A lt B lt C lt D Which element is expected to form Amphoteric Oxide?

Answer»

A
B
C
D

Solution :`._(25)Mn-1s^(2), 2s^(2),2p^(6),3S^(2),3p^(6),3d^(5),4s^(2)`
`l+m=0implies""i.e "s-subshell"`
`l=1, m=-1 ""i.e. "ONE orbital of p."`
`l=2, m=-2 ""i.e. "one of d-orbitals."`
Hence there are total of `13 e^(-)` having `l+m=0`


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