Answer
a. $Li^{+}$
b. $F^-$
c. $Mg^{2+}$
d. $Fe^{3+}$
Work Step by Step
1. Identify each symbol using a periodic table:
a. 3 protons = Li
b. 9 protons = F
c. 12 protons = Mg
d. 26 protons = Fe
2. Calculate the charge of each ion.
charge = $nº protons$ - $nº e^-$
a. 3 - 2 = +1
b. 9 - 10 = - 1
c. 12 -10 = +2
d. 26 - 23 = +3
3. Write the charge in the upper right of the symbol. If it is equal to +1 or -1, you don't need to write the $1$. (Put the number before the $\pm$)
a. $Li^{+}$
b. $F^-$
c. $Mg^{2+}$
d. $Fe^{3+}$
