Which of the following is an isotonic pair [AMU (Engg.) 2000]

1.	Which of the following is an isotonic pair [AMU (Engg.) 2000]
A.	\[_{19}^{40}K,\,_{20}^{40}Ca\]
B.	\[_{19}^{39}K,\,_{20}^{40}Ca\]
C.	\[_{18}^{33}Ar,\,_{\,18}^{40}Ar\]
D.	\[_{18}^{40}Ar,\,_{\,20}^{40}Ca\]
Answer» C. \[_{18}^{33}Ar,\,_{\,18}^{40}Ar\]

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