Periodicit
22.I REACTIONS OF PERIOD 3 ELEMENTS
Periodicatyrepeatng trends across the periods of the period tabu
The reacions ot penod 3 elements are all redox reactons
OxIdat1on state changes from O
Reactons with water !
Sodtum Vigorous rlacion, floats on surtace, etfervescena
melts into a bal, tomms strongy alkaline soluton ot Na Ot
2Na is) t 2H,0 o) 2 Na OH cag) t He cg)
Magnesium- much slower reaction,some etevescene, forms
less alkaline solutuon as Ma COHJh solublu.
Mais) t 2H, Qu)Mg loH), s) +H, 4)
sparingly
Magnesium - much tuster with steam, bright wbite tlame, white
solid torms - Me Os)
Reactons with OX4gea
Sod1um burns with yelow tlame, wn1te sold tormms
2Nas) 0 g) Na, Qus)
Magnesum- br1ght uwhite tame, whte sold tornns
Alumiaum whte tlame, white sol1d torms
usualy Loated with a strongy bonded surtau ot oxide
tALus) t 30, 19) 2Al0 (s)
Slhcon- forms Oxide when heated strongy
Si(s) t
Phosphorus - red cnd white phosphorus are auotropes
in limtec oxyyen, Pz03 may be formed
Py Oiois)
Sultur - blue tlame, torms colourless gas
25r930: (9) 204 g)
22.I REACTIONS OF PERIOD 3 ELEMENTS
Periodicatyrepeatng trends across the periods of the period tabu
The reacions ot penod 3 elements are all redox reactons
OxIdat1on state changes from O
Reactons with water !
Sodtum Vigorous rlacion, floats on surtace, etfervescena
melts into a bal, tomms strongy alkaline soluton ot Na Ot
2Na is) t 2H,0 o) 2 Na OH cag) t He cg)
Magnesium- much slower reaction,some etevescene, forms
less alkaline solutuon as Ma COHJh solublu.
Mais) t 2H, Qu)Mg loH), s) +H, 4)
sparingly
Magnesium - much tuster with steam, bright wbite tlame, white
solid torms - Me Os)
Reactons with OX4gea
Sod1um burns with yelow tlame, wn1te sold tormms
2Nas) 0 g) Na, Qus)
Magnesum- br1ght uwhite tame, whte sold tornns
Alumiaum whte tlame, white sol1d torms
usualy Loated with a strongy bonded surtau ot oxide
tALus) t 30, 19) 2Al0 (s)
Slhcon- forms Oxide when heated strongy
Si(s) t
Phosphorus - red cnd white phosphorus are auotropes
in limtec oxyyen, Pz03 may be formed
Py Oiois)
Sultur - blue tlame, torms colourless gas
25r930: (9) 204 g)
