The key word to describe the nature of ionic bond is of electrons

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• When dopant with valence electrons less than those in the host semiconductor is introduced, the resulting doped system is n-type
• The scanning electron microscopy（SEM）uses a focused beam of high-energy electrons to generate a variety of signals at the inside
• In the fuel cell，the（）is a substance specifically designed so ions can pass through it, but electrons cannot.
• Atomic level structure involves electrons within the individual atoms and interactions with their nuclei.
• Polymers transmit heat mainly through free electrons.