Which best describe earths magnetic field

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

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.

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?