Question

why there is no valency of plastic​

Answer 1

Answer:

Because they are in the highest energy level, they are generally the most involved in chemical reactions since they are the easiest to transfer. The function of valence electrons is to transfer between the atom, gaining or losing electrons in the process, in an effort to bring about stability to the atom.

more info

Nitrogen is found to have either 3 or 5 valence electrons and lies at the top of Group 15 on the periodic table. It can have either 3 or 5 valence electrons because it can bond in the outer 2p and 2s orbitals.

Answer 2

There is valency for elements. But plastic is a compound. Thus plastic does not have valency.

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