What element has the smallest size in the third period of periodic table

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

How does a hydroelectric power plant converts energy into energy.

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.