Enter the appropriate symbol for an isotope of potassium-39 corresponding to the isotope notation AZXZAX. Express your answer as a chemical symbol using isotope notation.

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5