5.1- Electron Structure Flashcards
What does the principal quantum number indicate?
The shell occupied by the electrons
How many electrons can the 1st shell hold?
2
How many electrons can the 2nd shell hold?
8
How many electrons Can the 3rd shell hold?
18
How many electrons can the 4th shell hold?
32
What is an orbital?
A region around the nucleus that can hold up to 2 electrons with opposite spins
What are the 4 types of orbitals?
• S orbital
• P orbital
• D orbital
• f orbital
What is the shape of a s-orbital?
Spherical
What is the shape of a p-orbital?
Dumb -bell shape
Hour many orbitals are foundin a s subshell?
1
How many electrons can be held in a S sub shell ?
2
How many orbitals does a P sub shell have ?
3
How many electrons can be held in a p subshell?
6
Hour many orbitals are present in a D subshell?
5
How many electrons can be held in a d sub shell ?
10
How many orbitals are found in a F subshell ?
7
How many electrons can fill F subshell?
14
What are the rules by which electrons are arranged in a shell?
• electrons are added one at a time
• lowest available energy level is filled first
• each energy level must be filled before the next one can fill
• each orbital is filled singly before pairing
• 4s is filled before 3d
Why does 4s orbital fill before 3d orbital?
4s orbital has a lower energy than 3d before it is filled
How do electrons pair and why?
•The 2 electrons in an orbital must have opposite spins
• this helps to counteract the repulsion between the negative charges of the two electrons
