Question 6 - Past Year - 2 Mark Questions - Chapter 5 Class 10 - Periodic Classification of Elements

The electronic configuration of an element ‘X’ is 2, 8, 6. To which group and period of the modern periodic table does ‘X’ belong. State its valency.

Answer

Electronic configuration = 2,8,6

Number of valence electrons = 6

• Group number = 10  + number of valence electrons = 10 + 6 = 16
• Number of shells = 3, so it belongs to the 3rd period .

• Since this element requires 2 electrons to attain noble gas configuration, its valency is 2.