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| 1. |
No chemical compound of helium is known Or Helium forms no real chemical compound. |
| Answer» Solution :Firstly, He does not contain d-orbitals in the valence shell and HENCE electrons cannot be promoted to higher energy levels like that in Xe to form bonds. Therefore, helium does not form chemical compounds. SECONDLY, IONIZATION ENTHALPY of He is sufficiently higher (2372 kJ `mol^(-1)`) than those of Xe (1170 kJ `mol^(-1)`) and `O_(2)` (1175 kJ `mol^(-1)`). | |