Question

tomorrow my exam plz answer....the question

A----Z(90) + n(140), B----Z(92) +n(138) , C----- Z(90)+n(142)
(a) A and B are isotopic
(b) A and B are equilibrium
(c) B and C are equilibrium
(d) B and C are isotopic

select wrong statement
1. only a,b
2. only c,d
3. only b,d
4. only a,c

Answer 1

option 1 only a, b
A &B are not isotopic bcoz their atomic numbers are not same
A&B are not in equilibrium