WorksheetsElectronic Configurations
Total questions: 21
Worksheet time: 41mins
The electron configuration of an atom is 1s22s22p6 The number of electrons in the atom is
3
5
6
10
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.
All three.
The lower the principal quantum number (n) the lower the energy.
The Aufbau Principle states that electrons enter the lowest energy orbitals first.
Which one of the following is the electronic configuration of the bromine atom?
1s22s22p63s23p63d104s14p6
1s22s22p63s23p63d104s24p7
1s22s22p63s23p63d104s24p5
1s22s22p63s23p63d104s24p6
Which one of the following does not represent the electronic configuration of an atom in its ground state?
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3d1
Which one of the following contains no unpaired electrons in the ground state?
Be
F
Si
N
Which one of the following is the electronic structure of a metal with a maximum oxidation state of +3?
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6 3s2 3p1
1s2 2s2 2p6 3s2 3p6 3d10 4s2
The number of electrons in the 3d orbital of the atom of atomic number 27 is
5
6
7
10
The vanadium atom (atomic number 23) in its ground state has the electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d3 4s2
1s2 2s2 2p6 3s2 3p6 3d2 4s3
1s2 2s2 2p6 3s2 3p6 3d1 4s2 4p2
1s2 2s2 2p6 3s2 3p6 3d2 4s2 4p1
1s22s22p63s2
1s22s22p4
The Aufbau principle states:
lower energy orbitals fill before higher energy orbitals
one electron goes into each until all of them are half full before pairing up.
no two electrons can be identified by the same set of quantum numbers (i.e. must have different spins).
the position and the velocity of an electron cannot both be measured exactly, at the same time, even in theory.
Hunds rule states:
lower energy orbitals fill before higher energy orbitals
one electron goes into each orbital until all of them are half full before pairing up.
no two electrons can be identified by the same set of quantum numbers (i.e. must have different spins).
the position and the velocity of an electron cannot both be measured exactly, at the same time, even in theory.
Pauli's exclusion principle states:
lower energy orbitals fill before higher energy orbitals
one electron goes into each orbital until all of them are half full before pairing up.
no two electrons can be identified by the same set of quantum numbers (i.e. must have different spins).
the position and the velocity of an electron cannot both be measured exactly, at the same time, even in theory.
Copper has which of the following electron configurations?
1s2 2s2 2p6 3s2 3p6 3d10 4s1
1s2 2s2 2p6 3s2 3p6 3d9 4s2
1s2 2s2 2p6 3s2 3p6 3d7 4s2 4p2
1s2 2s2 2p6 3s2 3p6 4s2 4p6
Fe3+ ions have which electron arrangement?
1s2 2s2 2p6 3s2 3p6 3d6 4s2
1s2 2s2 2p6 3s2 3p6 3d5
1s2 2s2 2p6 3s2 3p6 3d3 4s2
1s2 2s2 2p6 3s2 3p6 3d4 4s1
