Hydrogen has three naturally occurring isotopes which figure into the average atomic mass found on the periodic table. (1.00974) : hydrogen -1, hydrogen -2, and hydrogen -3. how do hydrogen -1, hydrogen -2, and hydrogen -3 differ from each other? which would you guess is most abundant? explain your answer.
its for an important lab

H 1 one proton and no neutrons, H2  one proton and one neutron, H3 one proton and 2 neutrons.

H1 most abundant because average mass is 1.008, meaning far more have a mass of 1

Explanation:

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.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.