Is the number of electrons in different shells of an atom fixed or unlimited ? Explain by giving an example.​

the number of electrons in a particular shell is given by the formula 2n^2 .However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell. so electrons can be made to move onto higher energy level shell but as the no of electrons increases it becomes difficult as more and more force is required to move that electron into next higher energy level shell I hope I made it clear to you please mark my answer as brainliest if you like it

the number of electrons in a particular shell is given by the formula 2n^2 . However an electron when gets very exicited loose energy in the forms of radiation and comes in high energy level shell.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.