Blurting for Halogens and noble gases

Halogens are group 7 elements
They consists of bromine, chlorine and iodine
Iodine forms a grey solid

Group 7 elements are very reactive because they only need to lose 1 electron

As you go down group 7, elements become less reactive. This is because as you go down the group, the atom gets bigger and therefore the outermost electrons move away from the positive nucleus. This makes it harder for the element to react

Bromine is a brown liquid and poisonous
Iodine is a dark grey solid that forms purple vapours
Chlorine is a green gas and highly reactive, it is also poisonous

Noble gases are inert. They do not need to borrow electrons
As you go down the group, the melting and boiling point decreases