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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?_x005F_x000D_ |
A. | Element with 18 neutrons and 20 protons |
B. | Element with 19 neutrons and 18 protons |
C. | Element with 19 neutrons and 20 protons |
D. | Element with 18 neutrons and 22 neutrons |
Answer» E. | |