Question

lets practice a few examples of getting the number of valence electrons from the group number and also making the lewis symbols. write the number of valence electrons for the element below: element valence electrons se the periodic table of the main groups is pictured above (transition elements are not shown). the seventh - period elements that are shown as half gray are not well characterized, and their electron configurations are currently unknown.

Explanation:

Step1: Locate the element in the periodic table

Find Se (Selenium) in the periodic table. It is in group 16.

Step2: Determine the number of valence electrons

For main - group elements (groups 1 - 2 and 13 - 18), the number of valence electrons is equal to the group number minus 10 (for groups 13 - 18). For group 16, \(16 - 10=6\).

Answer:

6