Question

write the name of two elements and their atoms which shows variable valency​

Answer 1

Answer:

Elements with Variable Valency

Transition metals nickel, copper, tin and iron exhibit variable valency. Nonmetals such as nitrogen and oxygen also show variable valency. The products formed as a result of reaction with the different valency atoms differ in their properties.

Answer 2

calcium carbonate here is your best answer Mafia brainliest