Electron Configuration

As we used to draw Bohr diagram to predict the way of electrons display, it somehow takes me a bit of time to figure out the answer. But now, we're going to learn about a new method, Electron Configuration.electron configuration is the arrangement of elecrons of an atom, a molecule, or other physical structure. It concerns the way electrons can be distributed in the orbitals of the given system.

First of all, we have to know what is "Shell",
it is a value of N and Subshell is a set of orbitals of the same type, which are "s, p, d, f" that we are going to use it to show how it works.

Basically, we use these terms "s, p, d, f" to show electrons in the atom.
Let see what's the difference between them!

n=1 s-type > can fill 2 electrons
n=2 s, p type > can fill 6 electrons
n=3 s, p, d type > can fill 10 electrons
n=4 s, p, d, f type > can fill 14 electron

And now lets take a look the order of their pattern

So, the pattern is  1s2 > 2s2 > 2p6 > 3s2 > 3p6 > 4s2 > 3d10........................

And now we can do some excerises!
Oxygen, with 8 electrons.  > 1s2 2s2 2p4 : 2+2+4 = 8  (little notes, s,p,d,f doesn't have to fully fill)

Calcium, with 20 electrons. > 1s2 2s2 2p6 3s2 3p6 4s2 : 2+2+6+2+6+2 = 20

Lithium, with 3 electrons. > 1s2 2s1

Sulphur, with 16 electrons. > 1s2 2s2 2p6 3s2 3p4 : 2+2+6+2+6 = 16