Which is the most important characteristic in determining an element's chemical properties?
a. the number of protons
b. which period it is found in
c. the number of valence electrons it contains
d. its outermost energy level
Answer: C
Which is the most important characteristic in determining an element's chemical properties?
a. the number of protons
b. which period it is found in
c. the number of valence electrons it contains
d. its outermost energy level
Answer: C