Consider the element sodium. it's atomic number is and equals a) 11; the number of protons b) 12; the number of neutrons c) 23; the sum of protons and neutrons d) 23; the number of electrons

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

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