The atomic number of sodium is 11 and its mass number is 23. It has_________
A. 11 neutrons and 12 protons
B. 12 protons and 11 electrons
C. 11 electrons and 12 neutrons
D.12 electrons and 11 neutrons
Answer:C
The atomic number of sodium is 11 and its mass number is 23. It has_________
A. 11 neutrons and 12 protons B. 12 protons and 11 electrons C. 11 electrons and 12 neutrons D.12 electrons and 11 neutrons