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Ionisation enthalpy values of Se, Br, Te...

Ionisation enthalpy values of Se, Br, Te and I are 869, 941, 1191 and 1142kJ`*mol^(-1)`. The values are not arranged in the correct order. Predict for which elements the ionisation enthalpy value is 869 kJ`*mol^(-1)` and 1142`kJ*mol^(-1)` respectively.

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Se and Te are found in the fourth and fifth period of group 16 in the periodic table, on the other hand, Br and I, are found in the fourth and fifth period of group 17. on moving across a period from left to right, ionisation enthalpy incrases whereas on moving down a group, its value decreases. so, the elements in increasing order of ionisation enthaly is `Te lt I lt Se lt Br` . therefore, ioniation enthalpy vlaues of Te and Br are 869 and 1142 kJ`*mol^(-1)` respectively.
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