john newlands arranged the order of the peroid table in order of mass however didnt take into acount that scientist are finding new elements
peroidic table - mandeleeve
he ordered them in atomic wight abd left spaed for where they predicted new elements to be discovered however he didnt predict some correct so they chnaged it to what it is now
what group are alkali metals
1
when alkali metals react wiht water they create an alkali solution
alkali metals hvae a very low density
alkali metals as you go down the group the melting point decreases
what group is the noble gasses
0
noble gasses dont react
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noble gasses melting point as you go down the group increases
what group are the halogens
7
the melting point of halogens as you go down the group increase
