HEY can anyone tell me the Atomic Mass of Helium and also what ever the number u get pls round it!!

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?