Answer:f
- First option: <em>the melting temperature is relatively high.</em>
Explanation:
You can look at the melting temperature at any table that summarizes the main properties of this compound, <em>potassium chloride</em>.
Such melting point is 770 °C, which is relatively high.
<u>Why is this?</u>
Potassium chloride is a ionic compound formed by the cations of potassium, K⁺, and the chloride anions, Cl⁻. Its unit formula is KCl.
The ionic bond between K and Cl is possible because each K atom is able to yield its valence electron to one Cl atom which has 7 valence electrons.
Then, the K atoms become positive ions (cations) K⁺, while Cl atoms become negative ions (Cl⁻).
These two ions with opposite charge are bonded by the force of electrostatic attraction. This is a ionic bond.
<em>Melting point</em>, so as boiling point along with other physical properties, depends on the attraction force between the atoms.
Hence, since the attrative forces between the ions are relatively strong, the <em>melting point</em> of the ionic compounds, such as potassium chloride, are <em>relatively high.</em>
