Question 6.1: a. Write the symbol and name for the ion that has 7 protons ...

a.  The element with 7 protons is nitrogen. In an ion of nitrogen with 10 electrons, the ionic charge would be 3-, [(7+) + ( 10-) = 3-]. The ion, written as $N^{3-}$ , is the nitride ion.
b.  The element with 20 protons is calcium. In an ion of calcium with 18 electrons, the ionic charge would be 2+, [(20+) + (18-) = 2+]. The ion, written as $Ca^{2+}$, is the calcium ion.