
The number of d-electrons in (Z = 26) is not equal to the number of electrons in which one of the following?
(a)- d-electrons in Fe (Z = 26)
(b)- p-electrons in Ne (Z = 10)
(c)- s-electrons in Mg (Z = 12)
(d)- p-electrons in Cl (Z = 17)
Answer
497.1k+ views
Hint: First write the configuration of Fe in the ground state and then in , there is a removal of two electrons. Now compare all the configuration of the elements Fe, Ne, Mg, and Cl.
Complete answer:
Iron is the element that belongs to d-block so its configuration in ground state is given below:
When there is an excitation of two electrons then the converts into . So from the above configuration, two electrons will be removed from the orbital. So the configuration becomes:
Now, the electronic configuration of having atomic number 26 is:
So, it has the same number of electrons in d-orbital as that of an electron in d-orbital of , i.e., 6 electrons.
In having atomic number 10, the electronic configuration is:
So, it has the same number of electrons in p-orbital as that of an electron in p-orbital of , i.e., 6 electrons.
In having atomic number 12, the electronic configuration is:
So, it has the same number of electrons in s-orbital as that of an electron in s-orbital of , i.e., (2+2+2) 6 electrons.
In having atomic number 17, the electronic configuration is:
So, the number of p-electrons in is: . But in , the number of p-electrons is: . So they are not equal.
Therefore, the correct answer is an option (d)- p-electrons in Cl (Z = 17).
Note:
Magnesium is the element of s-block having atomic number 12 and its last electron comes in the s-orbital. Neon and chlorine are the elements of p-block having atomic numbers 10 and 17 respectively and their last electron comes in the p-orbital.
Complete answer:
Iron is the element that belongs to d-block so its configuration in ground state is given below:
When there is an excitation of two electrons then the
Now, the electronic configuration of
So, it has the same number of electrons in d-orbital as that of an electron in d-orbital of
In
So, it has the same number of electrons in p-orbital as that of an electron in p-orbital of
In
So, it has the same number of electrons in s-orbital as that of an electron in s-orbital of
In
So, the number of p-electrons in
Therefore, the correct answer is an option (d)- p-electrons in Cl (Z = 17).
Note:
Magnesium is the element of s-block having atomic number 12 and its last electron comes in the s-orbital. Neon and chlorine are the elements of p-block having atomic numbers 10 and 17 respectively and their last electron comes in the p-orbital.
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