What is the correct IUPAC name for As₂S₅?

What is the chemical formula of the following compound

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false