Jenny knows that the atomic number of the element potassium, K, is 19. She also knows that the average atomic mass can be used to find out how many neutrons
are in most atoms of an element. If the average atomic mass of potassium is
39.098, how many neutrons are found in most atoms of potassium?
A. 19
B. 20
C. 39
D. 40

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.