chemistry notes chapter 11

periodic table

list of elements arranged in increasing order of proton number

metallic properties of elements

increase in metallic properties when going down the periodic table

name of group 1 element

alkali metals

physical properties of alkali metals

soft and be cut easily

low melting and boiling point

low densities

least reactive alkali metals

lithium

most reactive alkali metals

francium

middle reactivity of alkali metals

sodium , potassium , rubidium , caesium

name of group 17 elements

halogens

physical properties of halogens

low melting and boiling points

are coloured

going down group 17

increase in melting and boiling points

colours become more darker

more reactive down the group

displacement reactions

one element take place of another element in the compound

most reactive halogens

fluorine

least reactive halogens

tennessine

middle reactive halogens

chlorine , bromine , iodine , astatine

name of group 18 elements

noble gas

properties of noble gas

monoatomic non metals

colourless gas

low meting and boiling points

insoluble in water

unreactive