question_answer 76)

  Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.        

Answer:

  Atomic number of sodium (Z) = 11 Mass number of sodium (A) = 23 Number of protons in the nucleus = 11 Number of neutrons in the nucleus = 23 - 11 = 12 Number of electrons = 11 Electronic configuration of Na atom                                                                        Na+ ion is formed from sodium atom by loss of an electron (present in the outermost shell). Hence, its electronic configuration is  . However, number of protons and neutrons remains the same.