Final answer:
Gallium (Ga), located in Group 13 of the periodic table, has three valence electrons, which correspond with its group number.
Step-by-step explanation:
The number of valence electrons for an element can be determined using the periodic table. Gallium (Ga) is located in the boron group (Group 13) of the periodic table, thus it has three valence electrons. This information is crucial for predicting chemical bonding and reactivity when writing Lewis structures or understanding an element's chemical properties. The group number corresponds with the number of valence electrons for the main group elements, except for the transition metals.