What are some chemical changes in oxygen?

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

What happens to the atomic radius when an elctron is lost

In a ball-and-stick molecular model, what do the sticks represent?