1.

._(Z)X^(M) + ._(2)He^(4) rarr ._(15)P^(30) + ._(0)n^(1). Then

Answer»

`Z = 12, M = 27`
`Z = 13, M = 27`
`Z = 12, M = 17`
`Z = 13, M = 28`

SOLUTION :EQUATE ATOMIC no. and MASS no.


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