This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: to form NaCl) are usually extremely exothermic . The loss of an electron from an element: • Always endothermic (takes energy to strip the e' from the atom) • Na(g) -> Na + (g) + 1e-∆ H = 496 kJ/mol The gain of an electron by a nonmetal: • Generally exothermic (energy released) • Cl(g) + 1e--> Cl-(g) ∆ H = -349 kJ/mol The formation of NaCl from Na and Cl would thus require the input of 147 kJ/mol . However, it appears to be a highly exothermic reaction. Ionic compounds are stable due to the attraction between unlike charges : • The ions are drawn together • Energy is released • Ions form solid lattice...
View Full Document