Which of the following statements with regard to Isotopes and Isobars is/are correct? 1. Isotopes have same mass number. 2. Isobars have same atomic number. Select the correct answer using the code given below :

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Q: 75 (NDA-II/2008)

Which of the following statements with regard to Isotopes and Isobars is/are correct?
1. Isotopes have same mass number.
2. Isobars have same atomic number.
Select the correct answer using the code given below :

question_subject: 

General Knowledge

question_exam: 

NDA-II

stats: 

0,24,35,4,4,27,24

keywords: 

{'isotopes': [0, 0, 3, 6], 'same atomic number': [0, 0, 0, 1], 'isobars': [3, 1, 4, 4], 'same mass number': [0, 0, 1, 1]}

Option 1 states that isotopes have the same mass number. This statement is incorrect. Isotopes are atoms of the same element that have different numbers of neutrons, therefore, they have different mass numbers.

Option 2 states that isobars have the same atomic number. This statement is also incorrect. Isobars are atoms of different elements that have the same mass number but different atomic numbers.

So neither option 1 nor option 2 is correct. The correct answer is option 4, which states that neither statement 1 nor statement 2 is correct.

In conclusion, isotopes do not have the same mass number, and isobars do not have the same atomic number.

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