1. The electron gain enthalpies of Be and Mg are positive. What is you

1.	1. The electron gain enthalpies of Be and Mg are positive. What is your opinion? Justify. 2. Electron gain enthalpies of nobles gases have large positive values. Why?
Answer» 1. The statement is correct. Electron gain enthalpies of Be (+240 kJ/mol) and Mg (+230 kJ/mol) are positive because they have stable electronic configurations with fully filled s-orbitals (Be – 2s², Mg – 3s²). Hence, the gain of electron is highly endothermic. 2. Noble gases have stable octet electronic configuration of ns² np⁶ (except He-1 s²) and they have practically no tendency to accept additional electron. They have large positive electron gain enthalpies because the electron has to enter the next higher principal quantum level leading to a very unstable electronic configuration. Hence, energy has to be supplied to add an extra electron.

1. The electron gain enthalpies of Be and Mg are positive. What is your opinion? Justify. 2. Electron gain enthalpies of nobles gases have large positive values. Why?

Answer»

1. The statement is correct. Electron gain enthalpies of Be (+240 kJ/mol) and Mg (+230 kJ/mol) are positive because they have stable electronic configurations with fully filled s-orbitals (Be – 2s², Mg – 3s²). Hence, the gain of electron is highly endothermic.

2. Noble gases have stable octet electronic configuration of ns² np⁶ (except He-1 s²) and they have practically no tendency to accept additional electron. They have large positive electron gain enthalpies because the electron has to enter the next higher principal quantum level leading to a very unstable electronic configuration. Hence, energy has to be supplied to add an extra electron.

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