My goodness.It's really suffocating and tedious for me since I have no background of whatsoever the "orbital" thing is about in the new topic,Atomic Structure.
First of all,i was lucky because i had my sister's notes(which was a miracle she didn't threw it yet),which aided a lot on my study for this topic.Secondly,i really don't understand anything when Mr Tan explained roughly on the topic to the class (So sorry!) It's my fault,haven't been reading up
So,apparently,chemistry's taking a hell lot of my sleeping time.haha.

Back to the main reason for this post,..

Protons(p) is positioned in nucleus,with +1electric charge,relative mass of 1.
Neutron(n) is positioned in the nucleus,with 0
electric charge,relative mass of 1.
Electron(e^-) is positioned around the nucleus,with -1 electric charge,relative mass of 1/1840.


Principal quantum numbers >No of energy lvl>e.g (n=1,n=2....)
Types of subshells: s,p,d,f. (Mr tan said we only need to learn up to s,p,d)
The sequence goes, 1s^2,2s^2,2p^6,3s^2,3p^6,3d^10
When drawn in boxes,(electron-in-boxes method).................each box can draw up to 2 electrons.
By which their spins is always opposite,starting from up arrows,followed by downward arrows
1s have the lowest energy,4f-the highest,however to take note,3d has higher energy than 4s

shapes of orbitals for s,-spherical
shapes of orbitals for p(px,pz,py)-Dumb-bell
Different aces of symmetry,mutually,perpendicular to one another,orbitals (px,py,pz) with the same p.q.n have the same energy,ie.they are degenerate

the laws/rules to follow:
1)Pauli Exclusion Principle
2)Aufbau (for building up) Principle
3)Hund's Rule

Ok,i typed this all out because i find the online notes gave quite a lot redundant information.(ops) haha.It's quite messy though,sorry Ms Jee/Mr Tan

As for Ionisation Energies,NEXT TIME PLEASE!