Question

What is valency. Give two examples of variable valency.​

Answer 1

Answer:

valency is defined as number of electrons gained or lost by an element to achieve its nearest inert gas configuration.

all the transition metals lying in the d block of our modern periodic table have variable valency.

for an example copper has two valencies of +2 and +1

another example is that iron have two valencies of+3 and +2

only zinc is the exception in d block elements which have a fixed valency

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Answer 2

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⭐ᴀɴsᴡᴇʀ⭐

Certain elements have more than one valency. They exhibit variable valency. For example, copper, tin, iron and mercury exhibit variable valency. Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO).