State the number of protons, neutrons, and electrons present, and identify each of the following ions as a cation or anion:

Strategy

The element symbol and the atomic number located in the bottom left of each give the number of protons. Th e mass number located in the top left is the sum of the protons and neutrons, so the number of neutrons = mass number - atomic number. The number of electrons is calculated from this equation: charge = the number of protons - the number of electrons. If the charge is positive, the ion is a cation, and if the charge is negative, it is an anion.

Transcribed Image Text:

(a) Na+ 11 (b) Br- 35