bilalasghar
Jan 6, 2012, 09:30 AM
A specie having 18 electron 20 neutrons charge -2. what will be its atomic mass?
ebaines
Jan 6, 2012, 10:16 AM
Atomic mass is equal to the number of protons plus the number of neutrons. If this element has 18 electrons and a charge of -2, how many protons does it have? Now from that - what's its weight?