| Atom/Ion | Number of electrons | Number of protons | Number of neutrons |
| A B C D E F | 4 10 17 17 18 19 | 3 11 17 17 18 19 | 4 12 18 20 22 21 |
Answer:
(a) A and B, because number of electrons and protons are
different for these elements.
(b) E, because it has complete electronic configuration 
(c) E and F, because these have same mass number (number
of protons + number of neutrons). [1/2]
(d) C and D, because these have same atomic number (number of protons).
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