If ‘E’ is the symbol for an element circle the symbols that represent isotopes of the same element a. 1120E b. 1020E c.1021E d.921E e.1023E f.1221E

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 natural processes produce large quantities of co2

Light waves can move through , but they travel fastest when they move through a(n) .