In the modern quantum-based atomic theory, what is the name given to a particular space around the nucleus in which an electron moves?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Which statement best describes the he properties of iconic compounds ?

How many moles of bromine are needed to produce 3.23 moles of potassium bromide