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# What are the valence electrons? For s-block and p-block elements show that the number of valence electrons is equal to its group number.

Last updated date: 21st Jul 2024
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Hint: We know that all elements have a characteristic property known as the atomic number. The atomic number of an element represents the number of electrons or protons present in the atom of the element. On the other hand, Aufbau’s Principle helps in determining the order in which the electron orbitals get filled.

The principal quantum number of the valence electron of $Fe$ is $3$ . Hence, it belongs to the 3rd period. Since iron belongs to d block, its group number can be calculated by using: [number of electrons in $\left( n-1 \right)$ d subshell] $+$ (number of electrons in (n) s subshell)
Number of valence electrons $=\text{ }Group\text{ }number\text{ }-\text{ }10$
The factor of $10$ arises due to the presence of 'd'-block elements in between s-block and p-block elements.