Answer:
the number of protons equals the number of
electrons
Explanation:
Because these particles have the same but opposite charges, equal numbers cancel out, producing a neutral atom.
Fluorine, Chlorine, Bromine, Iodine and Astatine are representing the family of elements called : halogens.
Halogens:
- all have 7 electrons in their outer shell,
- are very reactive elements,
- form - 1 ions.
Answer: C ) They have same chemical properties.
