The magnetic quantum number, ml is used to indicate the direction
of the sub-orbital in space. The allowed values for the
magnetic quantum numbers depends on the subsidiary quantum
number of the sub-orbital. For each sub-orbital, l, the
magnetic quantum number, ml, must lie in the range ml = + l
or ml = - l. Within an orbital, the sub-orbitals designated
by the subsidiary quantum number, l , have the same energy
level, but have different orientations in space.
Quantum mechanics is the mathematical description of
the behaviour of particles and energy at the atomic scale.
Quantum numbers are used to describe the different
aspect of the electronic shell, they are required to describe
the properties of each atomic orbital.
There are four quantum numbers :
Thus, for any atom, each electron in the orbitals about
the nucleus in the atom has a unique set of quantum numbers,
and no two electrons in the atom can have an identical
set of quantum numbers.
- Principal Quantum Number, n
- This quantum number describes the general overall
energy level and size of the orbital (i.e. shell).
- Azimuthal (or Subsidiary) Quantum Number, l
- This quantum number describes the shape of the
sub-orbital. Each principal level is divided into
sub-shells, which are designated by this number.
- Magnetic Quantum Number, ml
- This quantum number is used to indicate the direction
of the sub-orbital in space.
- Spin Quantum Number, s
- This quantum number indicates the spin of an
electron in the sub-orbital.
A Quark is a fundamental particle.
Quicklime, CaO, (i.e. calcium oxide) is manufactured by burning
limestone (i.e. calcium carbonate, CaCO3) in a furnace. It
reacts vigorously with water to produce slaked lime
(i.e. calcium hydroxide).
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