Aphysician has ordered 0.50 mg of atropine, intramuscularly. if atropine were available as 0.25 mg/ml of solution, how many milliliters would you need to give?

It will fall off and tip over. 

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

The heat added represents an energy change.