Question

3. (a) What do you understand by the term valency?
(b) What kind of valency do the metals generally
have?
(c) Name two elements each, whose ions have
valency +1, +2 and +3 respectively.​

Answer 1

Explanation: HOPE IT IS HELPFUL

a) The valency of an element is related to how many electrons are in the outer shell.

b) Metals generally have the tendency to lose electrons to make themselves stable. so metals have a positive valency.

c) hydrogen, lithium = +1

beryllium, magnesium =+2

boron, aluminum = +3

Answer 2

Answer:

(i) The number of electrons donated or accepted by an atom of an

element so as to have 8 electrons in its outermost orbit is called

valency.

(ii) Metals generally have positive valency.

(iii) Sodium, potassium and lithium have +1 valency

Magnesium, calcium and barium have +2 valency.

Chromium, aluminium and iron have +3 valency