Which element has an atomic number of 9 and an atomic mass of 19? A. boron
B. carbon
C. sulfur
D. fluorine

Which of the following is the best name for mgcl2

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.

What is the relationship between ozone and smog?