Question

Arrange the following metals in order of increasing electropositivity : ca, zn,Au,pb

Answer 1

Explanation:

Pb Au Zn Ca

I think this is the correct answer

Answer 2

The order of increasing electro-positivity, for the given elements, is Zn, Ca, Pb and Au.

• The electro-positivity of an atom indicates its tendency for electron donation.
• The electro-positivity trend increases down a group and decreases in a period from left to right.
• The decrease in electro-positivity in a period is a result of increased nuclear attraction on the outermost electrons.
• The increase in electro-positivity down the group is due to an increase in the size of the elements.
• Zinc (Zn) and calcium (Ca) belong to the same period, the fourth period. They belong to different groups. Calcium belongs to the IIA group whereas Zinc belongs to the IIB group.
• As the electro-positivity decreases in a period, Calcium is more electropositive than Zinc.
• Similarly, Aurum(Au) and Lead (Pb) belong to the same period, the sixth period. They belong to different groups, IB and IVA respectively.
• As the electro-positivity decreases in a period, Aurum is more electropositive than Lead.
• Aurum and Lead are more electronegative than Zinc and Calcium because of their large size.
• Thus the increasing order of electro-positivity is Zn<Ca<Pb<Au.