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1. The principal quantum number of the first d subshell is
The principal quantum number (n) tells what energy level the
electron of an element is at; n can only have a value of 1, 2, 3,
4, 5, 6, or 7.
Looking at the Periodic Table below, the first d subshell is the
3d subshell in the 4th row. n corresponds to the period that the
subshell is found in, but for the d subshells, n = n-1. The
principal quantum number for 3d is n = 3.
2. Which quantum number is responsible for the energy of orbital in an atom?
Definitions of n, l, 𝑚𝑙 , 𝑚𝑠 :
n = Principal Quantum Number. n can only be 1, 2, 3, 4, 5, 6, or 7.
(“The Principal Quantum Number indirectly describes the energy of
an orbital” (Purdue Research).)
This number is found from the period (row) of the element. The
exceptions are for the d and f subshells, which need one extra
step as shown in the figure above.
For d subshells, subtract 1 from the row to get n.
For f subshells, n is either 4 or 5. (n-2)f is just because
the f rows go in rows 6 and 7 on the periodic table.
l = Angular Quantum Number. Determines shape of orbitals,
dependent on knowing the value of n.
l can only be between 0 and n-1 for the element.
So, if n = 6, l can only be 0, 1, 2, 3, 4, or 5 for that element.
𝑚𝑙 = Magnetic Quantum Number. This is the number of orbitals and
their orientation. 𝑚𝑙 is dependent on know the value...
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