[" Where "n" represents shell no.and "Z" represents atomic number then the value of "T_(1,2):T_(21)" will "],[" be: "],[[" (a) "8:1," (b) "1:8," (c) "1*1," (d) "1,22]]

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(n,z) where n represents shell no. and Z represents atomic number then the value of T_(1,2):T_(2,1) , will be :

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(n,z) where n represents shell no. and Z represents atomic number then the value of T_(1,2):T_(2,1) , will be :

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(n,z) where n represents shell no. and Z represents atomic number then the value of T_(1,2):T_(2,1) , will be :

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(n,z) where n represents shell no. and z represents atomic number then the value of T_(1.2) : T_(2.1) will be :-

n = 2, represents ………….. Shell.

If in Bohr's model, for unielectronic atom, time period of revolution is represented as T_(nz) where n represents shell number and z represents atomic number then the value of T_(12):T_(21) will be

Each shell is represented by a number ‘n’ known as

It Z represent the atomic number and A represents mass number, then the number of electrons in an atom can be computed as

The area of the region represented by r<=|z-2|<=5 where z is a complex number is 9 pi then the value of r is