2.2.1 Electron Structure 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
Ho 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 two electrons with opposite spins
How many electrons can an orbital hold?
2
What are the 4 different types of orbitals?
s
p
d
f
What is the shape of a s orbital?
spherical
What is the shape of a p orbital?
Dumbbell 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 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 subshell?
10
How many orbitals are found in a F subshell?
7
How many electrons can fill F subshell?
14
When using “ electrons in box” representation, what shape is sued to represent the electrons?
arrows
What letter is sued to represent shell number?
n
From which shell onwards is S orbital present?
n = 1
From which shell onwards is P orbital present?
n = 2
From which shell onwards is D orbital present?
n = 3
From which shell onwards is F orbital present?
n = 4
What are the rules by which electrons are arranged in the shell? (5)
- Electron 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 so it is filled before
What is the electron configuration of krypton?
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Which electrons are lost when an atom becomes a positive ion?
Electrons in the highest energy levels
