How many neutrons does element x have if its atomic number is 25 and its mass number is 72?

What are four significant sources of ghgs that come from wostem washington?

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %