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 sr 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

Locate Sr (Strontium) in the periodic table. It is in group II.

Step2: Determine the number of valence electrons

For main - group elements (groups I - VIII, excluding transition elements), the number of valence electrons is equal to the group number. Since Sr is in group II, the number of valence electrons is 2.

Answer:

2