First slide

Occurrence , Electronic Congufiguration, Atomic Properties

Question

D, J, Y, B, Q and E are the elements belonging to 18^th group of Modern periodic table. The correct trend of densityin these elements is D > J > Y > B > Q > E. The element ‘J’ in the sequence is

Moderate

A

Kr
B

Rn
C

Xe
D

Ar

Solution

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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