Answer:
One atom is a metal, and one is a nonmetal.
One atom has a high electronegativity value, while the other value is relatively low.
Step-by-step explanation:
Ionic bonds formed between a metal and a non-metal, while in covalent bonds both participants are non-metal. In ionic bonds non-metals(more strong, negatively charged) get electrons from metal, while in covalent bonds electrons are shared. Ionic bonds have high melting and boiling point and no definite shape, its opposite in covalent bonds.
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