How does the number of valence electrons change for atoms as you move in order from element 1, Hydrogen (M), to element 18, Argon (An), on the periodic table? A. The number of valence electrons only increases

B. The number of valence electrons decreases across the period and then increases at the beginning of the next energy level

C. The number of valence electrons increases across the period and then decreases at the beginning of the nen energy level

D. The number of valence electrons only decreases