There are four isotopes of lead and their relative abundance listed below.  use this information to calculate the approximate atomic mass of lead.  show all work   (4 points)                     82 protons, 122 neutrons, 1.4%                     82 protons, 125 neutrons, 22.1%                   82 protons, 124 neutrons, 24.1%                 82 protons, 126 neutrons, 52.4% show !

207.24

Explanation: Atomic mass = no of protons + no of neutrons

1) 82 protons, 122 neutrons , mass number= 82+122 = 204

2) 82 protons, 125 neutrons,  mass number= 82+125 = 207

3) 82 protons, 124 neutrons, mass number= 82+124 = 206

4) 82 protons, 126 neutrons, mass number= 82+126 = 208

Average atomic mass of an element =  

Average atomic mass of given element =  

The approximate atomic mass of lead is 207.24.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements