In the nucleus of 20Ca40, there are
A. 20 protons and 40 neutrons
B. 20 protons and 20 neutrons
C. 20 protons and 40 electrons
D. 40 protons and 20 electrons
Answer:B
In the nucleus of 20Ca40, there are
A. 20 protons and 40 neutrons B. 20 protons and 20 neutrons C. 20 protons and 40 electrons D. 40 protons and 20 electrons