1.

In the nucleus of  \[_{20}C{{a}^{40}}\] there are [CPMT 1990; EAMCET 1991]

A.        40 protons and 20 electrons
B.        20 protons and 40 electrons
C.        20 protons and 20 neutrons
D.        20 protons and 40 neutrons
Answer» D.        20 protons and 40 neutrons


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