1.

The atomic number of bromine is 35 and its atomic weight is 79. Two isotopes of bromine are present in equal amounts. Which of the following statement represents the correct number of neutrons

Answer»

`{:("First ISOTOPE","SECOND isotope"),(34,36):}`
`{:("First isotope","Second isotope"),(44,46):}`
`{:("First isotope","Second isotope"),(45,47):}`
`{:("First isotope","Second isotope"),(79,81):}`

Solution :Two isotopes of bromine are `._(35)Br^(79), ._(35)Br^(81)`
No. of NEUTRONS in `._(35)Br^(79) = 79 - 35 = 44`
No. of neutrons in `._(35)Br^(81) = 81 - 35 = 46`


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