Nitrogen (n) is made up of 99.632% 14n and 0.368% 15n. the atomic mass of 14n is 14.003 amu. the atomic mass of 15n is 15.000 amu. what is the average atomic mass of nitrogen? . a. 14.0 amu. b. 14.006 amu. c. 15.00 amu. d. 15.50 amu.

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.