The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40.

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asked Nov 4, 2017 in Chemistry by jisu zahaan (28,760 points) 26 375 814

The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements? 

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answered Nov 4, 2017 by sforrest072 (157,439 points) 61 410 947

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