Answer :
sulfur normally has 16 electrons (see the periodic table), but the 2- indicates that the atom is gaining 2 electrons. because of that, the answer would be 18.
hope this helped!
hope this helped!
Answer: (4) 18
Explanation: [tex]S^{2-}[/tex] is an anion formed when neutral sulfur atom gains two electrons.
Sulfur (S) is an element with atomic number of 16. Thus it contains 16 electrons.
S: [tex]1s^22s^22p^63s^23p^4[/tex]
It gains two electrons, the number of electrons increase to 18 and attain a stable configuration.
[tex]S^{2-}:1s^22s^22p^63s^23p^6[/tex]