Question

what is mean by variabke valency

Answer 1

However, in transition elements, an atom loses electrons from the shell next to the valence shell (penultimate shell). In such a situation the element exhibits more than one valency (variable valency). For example: Iron has 2 electrons in its valence shell. On donating these electrons, itsvalency is 2+.

Answer 2

when any metal has 2 valencies like iron has valency as 2 and 3

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