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Those d orbitals not involved in hybridization are favourably disposed towards π-bond formation.

Austenitic steel is not prone to embrittlement.

The crystals tend to oxidize in a moist atmosphere.

These bonds are rich sources of electrons and, therefore, are susceptible to reaction with electron-deficient reagents.

Источник: Русско-английский научно-технический словарь на Gufo.me