Answer:
The mass number
Explanation:
neutrons + protons = mass number
The volume of water in the graduated cylinder is 5.7 mL, volume increases to the value 17.3 mL when a 14.24 g of rock is dropped into it.
The increase in volume is due to the added volume of rock. Thus, volume of rock can be calculated by subtracting initial volume from the final volume as follows:

On putting the values,

For correct significant figures, volume should be in 2 significant figures.
Therefore, volume of rock will be 12 mL.
Fluorine is used to strengthen the enamel of your teeth, it can be used in acid form to etch glass, and chlorine is used in our drinking water and swimming pools. They're all part of the halogen family