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how to find group in electronic configuration

how to find group in electronic configuration

Grade:12th pass

2 Answers

Sakshi
askIITians Faculty 652 Points
8 years ago
hey student..
Write the electronic configuration. The highest Principal quantum number in the configuration gives the period, and the Electron shell(subshell) coming last is the group of the element. The number of electrons filled in the last subshell gives the position of the element within the group.

For example,
The configuration of iron is

4 is the highest principal quantum number.Hence, it belongs to the 4th period.
Last subshell is the d- subshell. Hence it belongs to d-group.
6 electrons are filled in last subshell.Hence it the 6th element in the d-group of the 4th period.
Bhavya
askIITians Faculty 1281 Points
8 years ago
Dear student
In order to get group number, after writing electronic configuration follow this simple funda:
Group no. will be same as valence electrons for s-subshell
Group no. will be addition of electrons in s-subshell and p-subshell plus 10 if valence electrons are entering in p-subshell
Group no. will be addition of electrons in s-subshell and d-subshell if valence electrons are entering in d-subshell.
The highest principal number will however give you period number.

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