Question

19. i) Give reason: Ionic radius of F (fluoride ion) is more than atomic radius of F (fluorine atom).
ii) How does ionization enthalpy varies down the group?
iii) Ionization enthalpy of nitrogen is more than that of oxygen. Give reason.
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Answer 1

Answer:

1-the a anion is formed by gain of electron,so a a electron is added to the atom,the ionic radius increases due to increase in number of shell

2-ionization enthalpy decrease down the group as atomic radius increases,it becomes easy to remove electron from the outermost shell because the electrons are far away from nucleus and the strength of nucleus on the elcetrons decrease so ionization enthalp decreases

Answer 2

Answer:

1)the ratio of electrons to protons in F ion is more hence more repulsion among electrons hence F ion radius will be more

2) as the atomic number increase down the group the ionisation potential decrease down the group due the distance between nucleus and valence electrons increase

Nitrogen atom has half filled electrons in the valence shell hence it's more stable