Answer:
(a)
(i) Because of small size of their atoms oxygen and fluorine they can form
strong bonds which may also facilitate the multiple
bonding. 1
(ii) The 3rd ionisation energy is relatively low as it
results in configuration
which is more stable than whereas
in the case of Mn the 3rd ionisation energy is very high as the 3rd electron is
to be removed from an extra stable configuration.
1
(iii) Due to strong interatomic attraction in d-orbitals d-electrons.
1
(b)
(i) 1
(ii)
1
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