There are two elementscalcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

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Q: 16 (CDS-I/2017)
There are two elements—calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
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question_subject: 

Logic/Reasoning

question_exam: 

CDS-I

stats: 

0,23,39,12,4,32,14

keywords: 

{'isotopes': [0, 0, 3, 6], 'atomic number': [0, 0, 0, 4], 'elements': [0, 0, 2, 5], 'isotones': [0, 0, 0, 2], 'mass number': [0, 0, 0, 3], 'isochores': [0, 0, 0, 1], 'isobars': [3, 1, 4, 4], 'calcium': [2, 0, 0, 4], 'argon': [2, 0, 3, 6]}