What is the mass number of an atom which is made up of 27 protons,33 neutrons and 27 electrons?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

What properties would have caused early researchers to name hydrogen "inflammable air”

Is cutting your nails a physical or chemical change