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A metallic substance
Is always zero
it gives up electrons
They have low melting points
Polar covalent
a force that holds atoms that are oppositely charged
nonpolar covalent
ions are surrounded by ions of the opposite charge
The ionic compound has a high melting point
Sodium only
O2
PCl3
They are composed of anions and cations
To obtain noble-gas electron configuration
Cl2
Nitrogen
only when it is melted or dissolved in water
double covalent bond
They have mobile valence electorns
Al2O3
Ca3(PO4)2
HCl
Ca2+
oxygen
the one that is full