How was the ancient idea of elements similar to what we now know about elements, and how was it different?

How many molecules are found in 1.32 mol of nacl?

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form