ch3 pne ws

The atomic number (Z) = #_________ in an atom; the atomic mass (A) is the #________+ #_________. The #neutrons can vary in an element; If 2 atoms of the same element have different #neutrons, then their atomic ________ is different and their atomic ________ is the same. This is the definition of an __________. In a neutral atom the #___________ = #__________. (Look in chapter 3 notes or text if necessary)In a charged atom called an ______, electrons have been lost or gained. The mass of an _________ is 1/1837 of a proton. The atomic masses on the periodic table are not whole numbers because they are _________ of the naturally occurring isotopes.