Los halógenos

Halogens, including fluorine, chlorine, bromine, iodine, and astatine, are highly reactive non-metals due to their electron configuration. They form salts with metals and exist as diatomic molecules in nature. Their physical states vary from gases to solids down the group, with reactivity decreasing due to increased electron shell shielding. Halogens are used for disinfection and in medicine but can be environmentally damaging, as seen with chlorofluorocarbons affecting the ozone layer.

Which of the following elements is not a halogen?

• Oxygen

• Chlorine

• Fluorine

• Bromine

What is the trend in melting and boiling points as you move down the group of halogens?

• They fluctuate randomly

• They increase

• They remain constant

• They decrease

Why does the reactivity of halogens decrease as you move down the group?

• The atoms gain more protons

• The atoms become smaller

• There are more electron shells shielding the nucleus

• The outer shell becomes more complete

Which halogen is commonly used to disinfect water?

• Bromine

• Chlorine

• Iodine

• Fluorine

What environmental issue is associated with chlorofluorocarbons?

• Ozone layer depletion

• Deforestation

• Global warming

• Acid rain