Can someone explain question number 6? I know the answer is AlF3 but I’m not sure why.

Different isotopes indicate that an element will have different numbers of

2. you__turn left on a red light if you are in the left-most lane of a one-way street, you're turning into the left-most lane of a one-way street, and no nearby sign prohibits the turn.

How do dying stars contribute to the formation of planets