Which pair represents isotone?
(1) 7N14 and 6C12 (2) 7N15 and 6C12(3) 20Ca40 and 18Ar40 (4) 20Ca40 and 19K39
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Answer:
²⁰Ca₄₀ and ¹⁹K₃₉ are isotones as they hve the same number of neutrons
in
Ca
atomic no ( Z) = 20
mass no (A) = 40
no of neutrons = A-Z
= 40-20
= 20
atomic no ( Z) =19
mass no (A) = 39
no of neutrons = A-Z
=39-19
=20
²⁰Ca₄₀ and ¹⁹K₃₉ no of neutrons are equal
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