Atomic Structure Again

Atomic Structure
Particle
Proton
Relative mass 1
Relative Charge +1

Neutron
Relative mass 1
Relative Charge 0

Electron
Relative mass 1/2000 or appro = 0 or 1/1840
Relative Charge -1

Proton number = Number of protons or neutrons in an atom
Nucleon number = sum of number of neutrons and protons in an atom. (Note this is not the same as relative atomic mass although in our syllabus it is the same for most atoms)
Isotopes are atoms of the same element having the same atomic number but different number of neutrons
Remember anything more than proton number 20, you CANNOT draw the electronic configuration. If the questions or number of valence electrons, LOOK AT GROUP NUMBER!!

Enjoy!
Entry by
Json Lim
http://www.oleveltuition.com/