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.
Answer: This reaction is called as Chemiluminescence. A type of reaction in which light is produced due to chemical reaction. While in case of Phosphorescence and Fluorescence light is emitted due to absorption of photons.
Explanation: i looked the answer up but your welcomee ❤
Vinegar is a mixture because other thing are added to make a whole new thing
homeostatic imbalance is the answer, because it's when the internal environment cannot remain in equilibrium.
Smaller - more valence electrons as you go across the period, so more electrons are being pulled closer towards the nucleus
