1.

Which elements isexpected tohave lowestfirstionizationenthalpy ?

Answer»

SR
As
Xe
S

SOLUTION :S' LIES in the3rd 'As' in 4thwhile 'Sr' and 'Xe'lie in thefifthperiod. Exceptnoblegasesin generalionizationenthalpyof the elements decreasesas theserialnumberof the periodincreases. Thusionizationenthalpiesof SandAs are HIGHERTHAN thatof Sr.ButXebeingthe noblegas has thehighestionizationenthalpy . ThusSr hasthe lowestionizationenthalpy .


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