![]() (ii) 1 mole of carbon is burnt in 16 g of dioxygen. is 3.0 × 10 –25 J, calculate its wavelength.Ĭalculate the amount of carbon dioxide that could be produced when The mass of an electron is 9.1 × 10 –31 kg. Therefore its electron affinity is small. As a result there are strong interelectronic repulsions in the relatively small 2p subshell of F, thus the incoming electron does not feel much attraction. However, in this case, the value of the electron gain enthalpy of Cl is more negative than that of F because of very small size of F atom. The electron gain enthalpy usually becomes less negative on moving down a group. (ii) Fluorine F and Cl belong to the same 17 th group of the periodic table and they are p block elements with fluorine belonging to 2 nd period and chlorine to 3 rd group of periodic table. Hence, the electron gain enthalpy of F is more negative than that of O. ![]() Also, F needs only one more electron to attain the stable noble gas configuration. As F contains one proton more than O, its nucleus can attract the incoming electron more strongly in comparison to the nucleus of O atom. An F atom has one proton and one electron more than O and as an electron is being added to the same shell, the atomic size of F is smaller than that of O. (i) Oxygen is a p block element present in 16 th group and 2 nd period while fluorine is also a p block element present in 17 th group and 2 nd period.
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