Question

In palladium number of electrons having (l=2) will be
A.20
B.18
C.16
D.20

Answer 1

A quantum number for an atomic orbital that describes its orbital angular momentum and tells about the shape of the orbital is known as azimuthal quantum number. We can also call it an orbital angular momentum quantum number, orbital quantum number or second quantum number. It is represented by the letter l. We can calculate the number of electrons by summing up the electrons in required orbitals.

Complete step by step answer:
We know that palladium is a chemical element that has a symbol Pd. The atomic number of palladium is forty-six. Palladium is a transition metal and it belongs to group 10 and period 5. It is a d-block element.
The electrons per shell in palladium is 2, 8, 18, 18.
We can write the electronic configuration of palladium as $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^{10}}4{s^2}4{p^6}4{d^{10}}5{s^0}$.
We have to know that if l=2, the value of azimuthal quantum number is two.
So, we have to know that
If l=0, the orbital is s-orbital and the shape is spherical.
If l=1, the orbital is p-orbital and the shape is dumb-bell.
If l=2, the orbital is d-orbital and the shape is clover leaf.
If l=3, the orbital is f-orbital.
The given azimuthal quantum number is two. Therefore, the electron will be in d-orbital.
From the electronic number of palladium, we can see that there are two d-orbitals presents that is $3d$ and $4d$. We can see there are 10 electrons present in 3d and 10 electrons present in 4d orbitals.
We can sum up the electrons in the electrons in 3d and 4d orbitals to get the number of electrons present in d-orbitals.
Number of electrons in d-orbital = $10 + 10$
Number of electrons in d-orbital = $20$
Number of electrons in d-orbital is twenty.

So, the correct answer is Option A.

Note:
We must remember that the Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements called the platinum group metals (PGMs). They exhibit similar chemical properties, but palladium contains the lowest melting point and is the least dense among them. We can use Palladium in electronics, hydrogen purification, chemical applications, treatment of groundwater, and jewelry. Palladium is a major component of fuel cells that react hydrogen with oxygen to give electricity, heat, and water.