Please explain (5) in detail.(Assertion-Reason)
Please explain (5) in detail.(Assertion-Reason) 5 6. Because : Mass numbers of most of the elements are fractional. : Mass numbers are obtained by comparing with the mass number of carbon taken as 12. Limiting line in the balmer series has a wavelength of 36.4

Dear Student,

Statement I: Mass numbers of most of the elements are fractional
Because  : The atomic mass are relative masses of atoms compared  with mass of atom C-12 normally taken as 12 whence the mass numbers are fractional

Regards.

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