Question

the atomic number and the mass number of sodium are 11 and 23 respictively . what information we can convey by this stament

Answer 1

The atomic number is the number of protons present in the sodium atom and so the number of protons in sodium are 11.
The number of electrons equal the number of protons in a neutral atom. Number of electrons is 11.
The number of neutrons = Mass number -atomic number = 23-11 = 12.