Pam C. answered 05/08/23
Retired Teacher that really misses teaching.
One water molecule consists of 1 Hydrogen and 2 Oxygen atoms (H20). Each oxygen atom needs two ions in order to have a full shell (8). One oxygen atom (A) bonds with the hydrogen atom and then bonds with the remaining oxygen atom (B). Oxygen atom A now has a full shell of eight. However, oxygen atom B still needs one more ionic bond in order for it's outer shell to be full. Oxygen atom B is attracted to the ions in the charged straw so the stream of water "bends" as it bonds with the remaining Oxygen atom.
H ⇔ O ⇔ O
⇓
Charged Straw