Answer:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Hope it's helpful to you
Answer:
Radium
Explanation:
It has the highest atomic number so it would have more shells, making it larger than the others.
Water, Water is not a pure substance. It is a mixture, and Chromatography
Work is labor and energy is useful for it because you need energy to work unless you will be tired
