Electron structure - 2 Flashcards
What does the principal quantum number indicate
The shell occupied by the electrons
What is a shell
A group of orbitals with the same principal quantum number
How many electrons can the 1st shell hold
2
How many electrons can the second shell hold
8
How many electrons can the third 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 two electrons with opposite spins
How many electrons can an orbital hold
2
What are the 4 types of orbitals
s
p
d
f
What is the shape of a s-orbital
Spherical
What is the shape of a p-orbital
Dum-bell shape
How many orbitals are found in a S subshell
1
How many electrons can be held in a S subshell
2
How many orbitals does a P subshell have
3
How many electrons can be held in a P subshell
6
How many orbitals are present in a D subshell
5
How many electrons can be held in a d-sub shell
10
What are the rules by which electrons are arranged in shells
1)Electrons are added at one time
2) Lowest available energy level is filled first
3) Each energy level must be filled before the next one can fill
4) Each orbital is filled singly before paring
5) 4s is filled before 3d
Why does 4s orbital fill before 3d
$s orbital has lower energy that 3d before its filled
Which electrons are lost when an atom becomes a positive ion
Electrons in the highest energy levels
