Draw atomic diagrams of the following isotopes. (Distinguish between protons and neutrons and assume the atom has no net charge.) Hydrogen-1
Hydrogen-2
Helium-4
Helium-3

Which substance absorbs 58.16 kj of energy when 3.11 mol vaporizes? a)ch4 b)h2s c)co2 d)nacl

Which best describes why nh4+ can form an ionic bond with ci-?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.