Consider an ionic compound, MX,, composed of generic metal M and generic gaseous halogen X. • The enthalpy of formation of MX, is AH; = -763 kJ/mol. • The enthalpy of sublimation of M is AHub = 169 kJ/mol. • The first, second, and third ionization energies of M are IEj = 619 kJ/mol, IE, = 1667 kJ/mol, and IE3 = 2525 kJ/mol. • The electron affinity of X is AHEA = -307 kJ/mol. (Refer to the hint). • The bond energy of X, is BE = 181 kJ/mol. Determine the lattice energy of MX,. AHjattice kJ/mol
Electron Affinity
When an element undergoes a chemical reaction, it either gains energy or loses energy. This gain or loss of energy is due to the phenomena that occur at atomic level. During reaction, atoms either gain electrons from other atoms or lose electrons to other atoms, and in that process, energy is produced.
P-Block Elements
Elements which are present on the right side of the periodic table are called p-block elements. In addition to the noble gases, they include the families of boron, mercury, nitrogen, oxygen and fluorine. These elements have diverse real-life implementations that we regularly experience around us.
Metals and Non-metals
The periodic table is composed of metals, semi-metals and nonmetal elements. The physical and chemical properties of metals and nonmetals differ from each other. The study of metals and nonmetals will help one to understand the appropriate application of the particular element.
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