First slide
Occurrence , Electronic Congufiguration, Atomic Properties

X, J, Z, B, Q and D are the elements belonging to 18th group of Modern periodic table. The correct trend of ionisation potenial in these elements is X > J > Z > B > Q > D. The element ‘X’ in the sequence is


Atomic radius….He<Ne<Ar<Kr<Xe;

Density ….He<Ne<Ar<Kr<Xe<Rn;

IP ….He>Ne>Ar>Kr>Xe>Rn;

Positive electron gain enthalpy ….Ne>Ar=Kr>Xe>Rn>He;Due to stable configuration

MP and BP…..He<Ne<Ar<Kr<Xe<Rn; Due to incease in the strength of Vanderwaals attractions

Abundance in atmosphere(by volume)…..Ar>Ne>He>Kr>Xe;

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