Cl atom in HCl has three lone pairs of electrons.
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If an atom has five valence electrons, it will have one lone pair of electrons.
XeF4 Xe has 8 valance electrons. F has 7 valance electrons * 4 = 28 valance electrons 8 + 28 = 36 valance electron total. Now, there are 4 bonds between Xe and the 4 F's, so that is a total of 8 electrons shared. 36 - 8 = 28 valance electrons left over. That means that 6 each go around the fluorine atoms as three lone pair per atom and one electron for the exon atom, unless this is a charged molecule.
Trigonal pyramidal (the EG is tetrahedral but one side is a lone pair)
Trigonal pyramidal
SeOF2 is known as Selenyl Difluoride. The Se atom has one pair of electrons, each F atom has three pairs, and the O has two pairs of electrons.