Pls answer the 18 th question
The same question is given below
18) ∆iH, ∆iH, and ∆iH, of an element M are 750, 1500 and 7750 kJ/mol respectively. The stable formula of its iodide would be:
1) MI
2) MI2
3) MI3
4) MI4
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Answers
Answer:
2} MI2
Explanation:
Third ionization energy (7750 kJ/mol) is much higher than the second ionization energy (1500 kJ/mol). This indicates alkaline earth metal with 2 valence electrons. When 2 valence electrons are removed, the stable electronic configuration of inert gas is obtained. When the third electron is lost, the stable electronic configuration of inert gas is broken. This requires a large amount of energy. Hence, the third ionization energy is very high.
The valency of alkaline earths is +2. The valency of Iodide is -1. So when making a chemical formula we cross multiply the valency to obtain the chemical formula MI2.
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Answer:
MI2
Explanation:
check the difference in the ionisation potentials .then you will find that the difference is largest btween the second and third so we have to choose the second and since it is in the second posiition we have to take the valency of m as 2 ie 2 electrons are lost from m. m^2+ i= mi2