1 Sodium chloride NaCl :Sodium chloride is a highly stable inorganic compound. The stability of NaCl can be attributed to the following factors:a Ionic bonding: Sodium chloride is formed by the ionic bonding between the positively charged sodium ion Na+ and the negatively charged chloride ion Cl- . The electrostatic attraction between these ions results in a strong and stable bond.b Lattice structure: NaCl has a face-centered cubic lattice structure, where each sodium ion is surrounded by six chloride ions, and each chloride ion is surrounded by six sodium ions. This arrangement leads to a highly stable crystal lattice, which contributes to the overall stability of the compound.c High lattice energy: The lattice energy of NaCl is high, which means that a large amount of energy is required to break the ionic bonds and separate the ions. This high lattice energy is a result of the strong electrostatic attraction between the ions and contributes to the stability of the compound.2 Ammonium chloride NH4Cl :Ammonium chloride is also a stable inorganic compound, but its stability is somewhat less than that of sodium chloride. The stability of NH4Cl can be attributed to the following factors:a Ionic bonding: Ammonium chloride is formed by the ionic bonding between the positively charged ammonium ion NH4+ and the negatively charged chloride ion Cl- . Similar to NaCl, the electrostatic attraction between these ions results in a stable bond.b Hydrogen bonding: The ammonium ion NH4+ has a central nitrogen atom covalently bonded to four hydrogen atoms. The positively charged hydrogen atoms can form hydrogen bonds with the negatively charged chloride ions, which adds to the stability of the compound.c Lattice structure: NH4Cl has a more complex lattice structure than NaCl, with each ammonium ion surrounded by eight chloride ions, and each chloride ion surrounded by eight ammonium ions. This arrangement also contributes to the stability of the compound.d Lower lattice energy: The lattice energy of NH4Cl is lower than that of NaCl, which means that less energy is required to break the ionic bonds and separate the ions. This lower lattice energy is due to the weaker electrostatic attraction between the ions compared to NaCl, and it results in a slightly lower stability for NH4Cl compared to NaCl.In summary, both sodium chloride and ammonium chloride are stable inorganic compounds, with NaCl being more stable due to its stronger ionic bonding, simpler lattice structure, and higher lattice energy. NH4Cl is also stable, but its stability is somewhat less than that of NaCl due to its weaker ionic bonding, more complex lattice structure, and lower lattice energy.