A) 27
B) 30
C) 29
D) 28
Correct Answer: A
Solution :
Both element have same atomic mass hence they are isobar. Number of protons in first element =27 Number of protons in second element = 30 Number of neutrons in first element = 30 Atomic mass of first element \[=p+n\] \[=27+30\] \[=57\] Hence, the atomic mass of second element is also 30. Number of neutrons in second element = atomic mass - number of protons \[=57-30=27\]You need to login to perform this action.
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