18 electrons
This ion has 16 protons and 18 electrons.
S2-
The symbol is S2- because to become an ion a sulfur atom gains two electrons and each electron has a 1- charge.
S for sulfur because the number of protons tells you the atomic number with is 16 and 16 is sulfur. The electrons means it is an ion with two more electrons than protons. The neutrons have no charge but add mass to the element.
A Sulfur atom has initially 6 electrons in its outer shell. To have a complete octet, meaning 8 electrons in the outer shell, it should gain 2 electrons, to form an S2- ion.
This ion has 16 protons and 18 electrons.
they both gain 2 electrons becoming the anions Oxide and Sulfide, O2- and S2-
S2-
S2- ion is isoelectronic with argon (with 18 electrons).
A sulfide ion, S2-, has 18 electrons. A neutral sulfur atom has 16 electrons, the same as the number of protons, which is the atomic number. Since electrons have a negative charge, a sulfur atom must gain two extra electrons in order to form the sulfide ion with a charge of 2-.
Sulfur's atomic number is 16. Therefore, neutral sulfur has 16 protons and 16 electrons. Since we're dealing with S2-, we need to add 2 electrons to that, giving 18 total.
Sodium loses one electron to form a Na+ ion. Sulfur gains two electrons to form a sulfide ion, S2-.
S2- the sulfide ion
The sulfur atoms gain two electrons to form the sulfide ion.
The symbol is S2- because to become an ion a sulfur atom gains two electrons and each electron has a 1- charge.
S2-
S for sulfur because the number of protons tells you the atomic number with is 16 and 16 is sulfur. The electrons means it is an ion with two more electrons than protons. The neutrons have no charge but add mass to the element.