Answer: Velocity
Explanation:
i just took the quiz for k12
There are only 2 atoms in an Oxygen molecule
1) is C because the arrows are pointing in so that means to squeeze
3) is A as the picture shows the dropper
After 3 half life periods you would have 5 grams of krypton left because half of 40 is 20 half of 20 is 10 and half of 10 is 5