whats the technical names for the keys on the numpad....?

i know 1, 3, 5 ,7, and 9

kp_end = 1
kp_PgDn = 3
kp_5 = 5
kp_home = 7
kp_PgUp = 9

whats the bind names for 2, 4, 6, and 8?

is it something like

kp_arrowleft????
kp_arrowright????

I really need to know for the use in counterstrike