1.

Calculate the number of neutrons in the following atoms : (a)""_(27)^(13)AI (b)""_(31)^(15)P ( c) ""_(190)^(76)O (d)""_(54)^(24)Cr

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Solution :NUMBER of neutrons (n) = Mass number (A) - Atomic number (z)
(a)`""_(27)^(13) `AINumber of neutrons (n) `= 27 (A) - 13 (z) = 14`
(b)`""_(31)^(15)P`Number of neuttons (n) `= 31 (A) - 15 (z) = 16`
( c) `""_(190)^(76)O` Number of neutrons (n) `= 190 (A) - 76 (z) = 114`


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