Question

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. ​

Answer 1

Answer:

If the element belongs to the II group, its valancy would be 2

Formula of molecules is determined by valancy cross multiplication.

Formula for group II with VA elements

Let Group II be x  element and Group VA be Y element

valancy of grp VA element will be 8-5=3

Element: X   Y

Valancy: 2    3

Formulae:X3Y2

Formula for group II with VIA elements

Let Group II be x  element and Group VIA be Y element

valancy of grp VIA element will be 8-6=2

Element: X   Y

Valancy: 2    2

Formulae:XY (as 2 and 2 being same valancy get cancelled)

Formula for group II with VIIA elements

Let Group II be x  element and Group VA be Y element

valancy of grp VIIA element will be 8-7=1

Element: X   Y

Valancy: 2    1

Formulae:XY2

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