Question

ccc scale, proportion, and quantity identify the number of protons and electrons in fluorine and iodine. the element fluorine helps prevent tooth decay and is found in many toothpastes. atomic number: 9

Explanation:

Step1: Recall atomic - number rule

The number of protons in an atom is equal to its atomic number. For a neutral atom, the number of electrons is equal to the number of protons.

Step2: Determine protons and electrons in fluorine

Fluorine has an atomic number of 9. So, the number of protons in fluorine is 9. Since it is neutral, the number of electrons is also 9.

Step3: Find iodine's atomic number

Iodine has an atomic number of 53. So, the number of protons in iodine is 53. And for a neutral iodine atom, the number of electrons is 53.

Answer:

Fluorine: Protons = 9, Electrons = 9; Iodine: Protons = 53, Electrons = 53