Module 2 - 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
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 two electrons with opposite
spins
How many electrons can an
orbital hold?
2
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
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 are present
in a D subshell orbital?
10
How many orbitals are found
in a F subshell?
7
How many electrons can fill F
subshell?
14
What letter used 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 points
● 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
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
