In general, ionic compounds have the following characteristics:
• They are solid at room temperature;
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• Its atoms arrange themselves in such a way as to produce a crystalline lattice (a crystal).
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• They are soluble in water;
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• They are capable of performing the phenomenon of dissociation (ion release) when they undergo fusion, that is, when they change from the solid state to the liquid state, or when they are dissolved in water;
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• They have high melting and boiling points;
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• They have shine;
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• They conduct current when dissolved in water or after undergoing the melting process.
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• Non-conductor at solid state.
Covalent compounds have the following characteristics:
• Physical State at Room Temperature: Under ambient conditions, molecular and covalent compounds are found in three physical states (solid, liquid, and gas).
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• Melting and Boiling Point: In general, the melting and boiling points of these substances are lower than those of ionic substances.
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• Electric current: In their pure forms, both liquids and solids do not conduct electric current.
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• Solubility: Polar dissolves into polar and non-polar dissolves into non-polar.
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• Tenacity: The resistance of covalent substances to impact or mechanical shock is low.
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• In general, they are brittle solids, as shown in the case of glass, which is formed by sodium and calcium silicates.Hardness: In general, they have high hardness.
With this in mind...
Answer: ionic bonds