Which of the following species is isotonic with 37 Rb 86 ?

Question

Which of the following species is isotonic with 37 Rb 86 ? (A)  38 Sr 87 (B)  36 Kr 84 (C)  39 Y 89 (D)  37 Mg 85

Tardigrade Admin · Accepted Answer

Isotonic species are those which have identical numbers of neutrons. 37 R b86 ; n=86-37=49 38 Sr 87 ; n =87-38=49 36 Kr 84 ; n =84-36=48 39 Y 89 ; n =89-39=50 37 Mg 85 ; n =85-37=48

Q. Which of the following species is isotonic with $_{37} R b^{86}$ ?

$_{38} S r^{87}$

$_{36} K r^{84}$

$_{39} Y^{89}$

$_{37} M g^{85}$

Isotonic species are those which have identical numbers of neutrons.

$37 R b^{86}; n = 86 - 37 = 49$

$38 S r^{87}; n = 87 - 38 = 49$

$36 K r^{84}; n = 84 - 36 = 48$

$39 Y^{89}; n = 89 - 39 = 50$

$37 M g^{85}; n = 85 - 37 = 48$

Q. Which of the following species is isotonic with 37​Rb86 ?

38​Sr87

36​Kr84

39​Y89

37​Mg85