Answer
a. 1 electron.
b. 2 electrons.
c. 3 electrons.
d. 1 electron.
e. 2 electrons.
Work Step by Step
1. Determine the amount of valence electrons.
a. Cl. Group 7A of the periodic table: 7 valence electrons.
b. Se. Group 6A of the periodic table: 6 valence electrons.
c. N. Group 5A of the periodic table: 5 valence electrons.
d. I. Group 7A of the periodic table: 7 valence electrons.
e. S. Group 6A of the periodic table: 6 valence electrons.
2. Since all these elements are nonmetals, they need to reach 8 valence electrons to get a stable electron configuration.
Thus, calculate how many electrons each atom has to gain in order to reach 8 valence electrons.
a. 8 - 7 =1
b. 8 - 6 = 2
c. 8 - 5 =3
d. 8 - 7 = 1
e. 8 - 6 = 2
