V3+, w2+, x+, y-, Z2+
Which groups of elements are most likely to be metals?

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?

Which fact represents evidence for the big bang theory?

Which three statements represent the benefits of performing experiments using computer simulations?