Question

this will be graded, so make sure you understand all the concepts before making an attempt. write the number of valence electrons for the element below. element valence electrons br 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 Br (Bromine) in the periodic table. It is in group VII.

Step2: Determine valence electrons based on group

For main - group elements, the number of valence electrons is equal to the group number (for groups I - VII). Since Br is in group VII, it has 7 valence electrons.

Answer:

7