60. The formation of covalent bonds between two unexcited atoms of chemical elements - electronic analogues: At and F is considered.
a) give a graphic explanation of the formation of covalent bonds between these atoms;
b) write down the electronic and valence diagram of the resulting molecule;
c) determine the order (multiplicity) of communication;
d) determine the valence of each element;
e) determine the number of σ- and π-bonds.

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