What isgroup element based on the electronic configuration and their period
Answer (1)
Student Expert
25th Apr, 2020
Hey!
When the electronic configuration is given, then
- Number of shells in an atom of the element tells about period number.
- Where as group number depends on the number of valence electrons. If the valence electrons are 1 , the group number equals the number of valence electrons :
1 Valence Electron - Group 1
2 Valence Electrons - Group 2
3 to 8 valence electrons - Add '10' to the valence electrons to get the group number of the element.
Example:
Chlorine (Cl) - Atomic Number 17
Electronic Configuration : 2 , 8 , 7
Period Number = Number of shells = 3
Group Number = Valence Electrons + “10” = 17
If it was magnesium then the group number would be 2 as UT has 2 valance electrons.
Hope it helped to clear your delimma.
Thank you
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