Electron Configuration Flashcards
What does electron configuration show
Shoes the arrangement of electrons in the atom of an element
List the energy levels
4f
4d
4p
3d
4s
3p
3s
2p
2s
1s
How many electrons can the S orbital hold
2
How many electrons can the P orbital hold
6
How many electrons can the d orbital hold
10
What is the Aufbau principle
When building up the electrons configuration of an atom in its ground state, electrons occupy the lowest available energy level where possible
What is the Hunds rule of multiplicity
States that when two or more orbitals of equal energy are available, the electrons occupy them singly before filling them in pairs
What is the Pauli exclusion principle
States that no more than two electrons can occupy an orbital and they must have opposite signs
why do electrons fill the 4s sublevel before the 3d sublevel
the 4s sublevel is lower in energy than the 3d sublevel.
electrond fill the lowest avliable sub- levels first.
Why are Cu and Cr different
They both have only one electron in the S orbital because the d block is more stable when half or completely filled
periodic table divided into what four blockes
S block, P block,D block,F block
What determines a elements place in a block
All the elements in the s block have their outer electrons in a s sub level, all those in the P block have their outer elements in a P orbital
What is the outer shell called
Valence shell
Why does the electrons of Cr and Cu start filling up the 3d orbital before the 4s orbital is full?
This is because if an orbital is excatly half filled or completely filled then it gives the atom extra stability
What is a ion
A charged atom
