Why hydrogen is placed in the first group of the periodic table, not in the 17th group with halogens as it requires only one electron to complete it's octate?
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Answered by
0
hydrogen could not be placed at appropriate position ad it resembles properties of metals as well as halogen..
like metals hydrogen combines with sulphur , oxygen, and halogen with similer formula .
eg. na2o =h2o
na2s=h2s
like metals hydrogen combines with sulphur , oxygen, and halogen with similer formula .
eg. na2o =h2o
na2s=h2s
soniyalodhi786:
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because in frst grp it has valwncy 1 and in 17 grp it can have valency 7
Answered by
4
This is because it is smallest in size containing 1 proton.. Due to this it placed in first position.. And its only contain 1 proton and 1 electron but no neutrons.. Althought group 17 elements also contain neutrons
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