
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
502.5k+ 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.
Latest Vedantu courses for you
Grade 9 | CBSE | SCHOOL | English
Vedantu 9 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹37,300 per year
Recently Updated Pages
Master Class 12 Economics: Engaging Questions & Answers for Success

Master Class 12 Maths: Engaging Questions & Answers for Success

Master Class 12 Biology: Engaging Questions & Answers for Success

Master Class 12 Physics: Engaging Questions & Answers for Success

Master Class 12 Business Studies: Engaging Questions & Answers for Success

Master Class 12 English: Engaging Questions & Answers for Success

Trending doubts
Which one of the following is a true fish A Jellyfish class 12 biology CBSE

Which are the Top 10 Largest Countries of the World?

a Tabulate the differences in the characteristics of class 12 chemistry CBSE

Why is the cell called the structural and functional class 12 biology CBSE

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Derive an expression for electric potential at point class 12 physics CBSE
