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Chemistry
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?
Element with 18 neutrons and 20 protons
Element with 19 neutrons and 18 protons
Element with 19 neutrons and 20 protons
Element with 18 neutrons and 22 neutrons
Correct Answer:
Element with 18 neutrons and 22 neutrons
Explanation:
Isobar: one of two or more atoms having equal atomic weights but different atomic numbers.
Mass number Electrons Neutrons
Calcium 40 20 20
Argon 40 18 22
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