What is the noble gas configuration for zirconium? A. [Xe] 5s2 4d1
B. [Xe] 4d1
C. [Kr] 4d1
D. [Kr] 5s2 4d1

Can someone me with questions 12 and 13 plz.

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Areaction in which products can react to re-form reactants is