Questions in atomic-structure

Select	Question
	What is the ratio of mass of an electron to the mass of a proton
	The number of electrons in an atom of an element is equal to its
	The nucleus of the element having atomic number 25 and atomic weight 55 will contain
	If $W$ is atomic weight and $N$ is the atomic number of an element,then
	The total number of neutrons in dipositive zinc ions with mass number $70$ is
	Which of the following are isoelectronic with one another
	The number of electrons in one molecule of $C{O_2}$are
	Chlorine atom differs from chloride ion in the number of
	$CO$ has same electrons as or the ion that is isoelectronic with $CO$ is
	The mass of an atom is constituted mainly by