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Question

(a) Account for the following: (i) $$Mg^{+2}$$ ion is smaller than $$O^{-2}$$ ion although both have same electronic structure, (ii) Ionisation enthalpy of nitrogen is more than that of oxygen,
(b) Write the IUPAC name and the symbol for the element with at.no.118.

Solution
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(a) (i) It is due to greater nuclear charge and greater effective nuclear charge in $$Mg^{2+}$$ and $$O^{2-}$$
(ii) It is due to stability of electronic configuration of nitrogen.
(b) Uuo (Ununoctium).

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Similar Questions
Q1
(a) Account for the following: (i) $$Mg^{+2}$$ ion is smaller than $$O^{-2}$$ ion although both have same electronic structure, (ii) Ionisation enthalpy of nitrogen is more than that of oxygen,
(b) Write the IUPAC name and the symbol for the element with at.no.118.
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Q2

Give reason.Mg2+ ion is smaller in size thean o2- ion although both have the same electronic structure.

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Q3
Give reasons for the following:

(a) Oxygen has lower ionisation energy than that of nitrogen.

(b) Electron gain enthalpy of chlorine is more negative than that of fluorine.

(c) Arrange O2, Al3+, Na+,F and Mg2+ in the increasing order of their sizes.

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Q4
(a) (i) Write the disproportionation reaction of H3PO3 .
(ii) Draw the structure of XeF4 .
(b) Account for the following :
(i) Although Fluorine has less negative electron gain enthalpy yet F2 is strong oxidizing agent.
(ii) Acidic character decreases from N2O3 to Bi2O3 in group 15.
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Q5

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionisation enthalpy than nitrogen. Explain.

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