Worksheets2.3 ELECTRONIC CONFIGURATION
Total questions: 13
Worksheet time: 9mins
The electron configuration of an atom is 1s22s22p3.
The total number of electrons in the atom is
3
4
5
7
The electron configuration of an atom is 1s2 2s2 2p6 3s2.
The number of valence electrons is
8
2
4
6
According to Aufbau Principle, electrons are filled into 4s orbital before 3d orbital.
When removing the electrons, the electron needs to be removed from which sub-shell first?
4s
3d
3p
1s
Cr (Z=24) shows anomalous electronic configuration.
The actual electronic configuration is
1s2 2s2 2p6 3s2 3p6 4s1 3d5.
This is because ...
the half-filled d-orbital (3d5) is more stable
the completely filled d-orbital (3d10) is more stable
the partially filled d-orbital (3d4) is more stable
What is the Aufbau principle?
Within an energy level, s orbitals are the lowest energy, followed by p, d and then f. F orbitals are the highest energy for that level.
The lower the principal quantum number (n) the lower the energy.
All three.
The Aufbau Principle states that electrons enter the lowest energy orbitals first.
All orbitals of equal energy (degenerate orbitals) are occupied by one electron before any single orbital is occupied by a second electron.
Aufbau Principle
Pauli's Exclusion Principle
Hund’s Rule
Core Notation
No two electrons in the same atom can have the same four quantum numbers.
Aufbau Principle
Pauli's Exclusion Principle
Hund’s Rule
Noble gas notation
Which rule is violated in the following orbital diagrams?
Hund's Rule
Aufbau Principle
Pauli's Exclusion Principle
Which rule is violated in the following orbital diagrams?
Aufbau Principle
Hund's Rule
Pauli's Exclusion Principle
What is the maximum numbers of electrons when n=2, l=0
(a)
What electron configuration matches an oxygen ion? (Z=8)
1s22s22p63s2, 3p64s23d104p5
1s22s22p4
1s22s22p6
1s22s22p63s23p64s23d1
