Chemistry Halogens

what are the halides

fluorine (F), chlorine (Cl), bromine (Br), iodine (I)

what are Group 7 elements are commonly known as

Halogens

what is the Reactivity trend in Group 7

The reactivity of halogens decreases as you go down Group 7.

what is the Most reactive halogen

Fluorine (F) is the most reactive halogen.

what is the Least reactive halogen

Astatine (At) is the least reactive halogen, although it is very rare and highly radioactive.

what is Chlorines state of matter at room temp

Chlorine (Cl) exists as a diatomic gas at room temperature and pressure.

what is Iodines boiling point compared to to the rest of the halogens

Iodine (I) has the highest boiling point among the halogens.

what is Fluorine melting point compared to to the rest of the halogens

Fluorine (F) has the lowest melting point among the halogens.

what happen when Halogens react with a metal

Halogens react with metals to form a salt compounds called metal halides. also will become a negative ion 1-

halogen + metal ——> metal halide

chlorine +sodium ——> sodium chloride

Cl + Na ——> NaCl

explain the Boiling point trend of halogens as you go down the group

The boiling points of the halogens increase going down group 7. This is because, going down group 7 as

• the molecules become larger

• the intermolecular forces become stronger

• more energy is needed to overcome these forces

colour and state of Chlorine and bromine at room temperature

Chlorine is a pale green gas, while bromine is a brown liquid at room temperature.

what happen in an Halogen displacement reaction?

A more reactive halogen can displace a less reactive halogen from a solution of its salt. e.g if fluorine is added to sodium chloride, the more reactive fluorine will displace the less reactive chlorine to become sodium fluoride and chlorine

sodium-chloride + fluorine ——> sodium fluoride +chlorine

NaCl + F ——> NaF + Cl