Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

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Question:Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

1.Element with 18 neutrons and 20 protons

2.Element with 19 neutrons and 18 protons

3. Element with 19 neutrons and 20 protons

4. Element with 18 neutrons and 22 neutrons

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  1. Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
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