Q14.87P - Chemistry: Molecular Nature Of Matter And Change

Question

a) Give the physical state and color of each halogen at STP.

Step-by-Step Solution

Answer

Halogens are a class of elements occupying group 17 of the periodic table. This group includes Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At). This group is the only group that consists of the elements in all three states of matter at standard temperature and pressure. Fluorine is found as a very pale yellow gas.

Step 1: Given

To give the physical state and color of each halogen at STP.

Step 2: Introduction

Halogens are a class of elements occupying group 17 of the periodic table. This group includes Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At). Halogen means salt former because, on reacting with metals, they form salts. This group is the only group that consists of the elements in all three states of matter at standard temperature and pressure. IUPAC's accepted values for standard temperature and pressure are 273.15 K and about 1 atm, respectively.

Step 3: physical state and color of each halogen at STP

Halogen	Physical state	Color
Fluorine F	Gas	Very pale- yellow
Chlorine Cl	Gas	Pale yellow-green
Bromine Br	Liquid	Reddish-brown
Iodine I	Solid	Lustrous metallic grey solid
Astatine At	Solid (predicted)	Metallic(probable)