1.

An electron is revolving in an orbit with a veloc- ity of 5.46xx107 cm s^(-1) . Calculate the wave length associated with the electron.

Answer»

Solution :Radius `r_n=(0.529xxn^2)/ZrArr3.3`
`(0.529xx25)/ZrArrZ=4`
`therefore` Atomic number of X is 4 and atomic number of is 28.
Electronic configuration of Y is `1s^22s^22p^63s^23p^64s^23d^8` and valenc electrons are `4s^2` electrons
Electron : `1 RARR N= 4,1=0 m=0,s=-1/2`
Electron `2 rarr n= 4,1=0,m=0,s=-1/2`


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