An element belongs to group II. What would be its valency ? Write the formulae of molecules of compounds it will form with elements in VA, VIA and VII A groups.
Answers
Answer:
Valency 2.
VA Mg
2+
Mg
−3
Mg
3
VIA
Symbols Valencies
Magnesium Oxide Magnesium Oxide
Mg O 2
+
2
−
(i) Write the symbols
On the left hand side On the right hand side
Calcium Chloride
Ca Cl
(ii) Write the valency of the symbols
At the top right corner At the top right corner
Positive ion Negative ion
Ca
2+
Cl1−
(iii) Interchange the valency number
(Ignore the (+) and (-) signs)
Ca
2+
Cl
1−
1 2
(iv) Write the interchanged numbers at the base
But ignore the + and the - signs
Ca
1
Cl
2