The Halogens

The video discusses halogens, a group of non-metals including fluorine, chlorine, bromine, iodine, and astatine. These elements are highly reactive due to their electron configuration, existing naturally only in compounds. Halogens form colored vapors and exhibit trends in physical states and reactivity. They are hazardous but useful, with applications in disinfection and medicine. However, some halogen compounds, like CFCs, have long-lasting environmental impacts.

Which of the following is NOT a halogen?

• Fluorine

• Oxygen

• Chlorine

• Iodine

What is the physical state of bromine at room temperature?

• Liquid

• Solid

• Plasma

• Gas

Why does reactivity decrease down the group of halogens?

• Decreased atomic size

• Increased electron shielding

• Decreased electron shielding

• Increased atomic size

Which halogen is commonly used to treat water?

• Fluorine

• Chlorine

• Bromine

• Iodine

What environmental issue is associated with chlorofluorocarbons (CFCs)?

• Acid rain

• Deforestation

• Ozone layer depletion

• Global warming