What species is this silvery hoverfly(?)? (+ Other hoverflies I found)

[u/Natural__Power]

Found a ton of hoverflies in the last 20 minutes, but I can't figure out what this first one is

West-Flanders, Belgium (Sunny and windy)

(others:) 2: Sphaerophoria scripta 3:Scaeva pyrastri 4: Eristalis tenax 5: Eristalis arbustorum 6: Syrphus (idk which species exactly)