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Method to predict the period group and block of given element

Method to predict the period group and block of given element

Grade:12th pass

1 Answers

Simran Vinaik
askIITians Faculty 1230 Points
5 years ago
When the electronic configuration is given, then

PERIOD NUMBER -Number of shells in an atom of the element.
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.

Examples -

Magnesium (Mg) - Atomic Number 12

Electronic Configuration : 2 , 8 , 2

Period Number = Number of shells = 3

Group Number = Valence Electrons = 2

2. Chlorine (Cl) - Atomic Number 17

Electronic Configuration : 2 , 8 , 7

Period Number = Number of shells = 3

Group Number = Valence Electrons + “10” = 17

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