Answer
See the answer below.
Work Step by Step
$BF_3$: boron has three valence electrons and is making three bonds, it is surrounded by 6 electrons.
$SeF_4$: Se has 6 valence electrons and it's making 4 bonds, it's surrounded by 10 electrons
$BrF_4^-$: Br has 7 valence electrons, gained 1 and it's making 4 bonds, it's surrounded by 12 electrons
$XeF_2$: Xe has 8 valence electrons and it's making 2 bonds, it's surrounded by 10 electrons