Which elements are halogens and how did they become that way?
Which elements are halogens?
What are some of the most reactive halogens? What are some chemical properties of halogens and alkali metals? How are halogens and alkali metals structured? What are halogens, alkaline earth metals and alkali metals? Why are halogens very reactive? Why are halogens all diatomic? How do halogens and alkali metals react with one another? What are polonium halos? Why are alkali metals and halogens so reactive? Why are halogens coloured? What are polonium halos and why do they matter? What are halogenated hydrocarbons? What are some examples? What are elements and compounds? What are some examples? How do compounds differ from elements? What are some elements with similar chemical properties? What kind of crystals are these? What are some examples of elements and compounds? What are the technology features in Halo 4? Why do they still call it Halo in Halo 4 and 5 without any actual Halo's? What are some of the chemical properties of the isotopes? What are the chemical properties of isotopes? What is an Alchemist? Do they exist in real life? What are radioactive substances? What are some examples? What are isotopes? What controls the chemical properties of a particular isotope? What are air pollutants? What type of elements form ionic and covalent compounds? What is a sulfuric acid element? Who are the most important characters in Fullmetal Alchemist: Brotherhood? What are the types of radioactive particles?