Arrange the following in increasing order of size: Cl-, S2-, Ca2+, Ar


Ca2+ < Ar < Cl- < S2-.
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Name two ions which are iso-electronic with Ar (Z = 18).


K+, Ca2+ are isoelectronic ions.
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Arrange,  l, l-, l+ in increasing order of size.


Increasing size order of given series is,
 l+< l < l
-
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Arrange the following in decreasing order of ionic size:

Mg2+,  O2-,  Na+, F-,  N3-.


Decreasing order of ionic size
N
3- > O2- > F- > Na+ > Mg2+.
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What is the correlation between atomic size and ionisation enthalpy?


Larger the size of atom, lesser is the force of attraction from the valence electrons. Thus, lower value of ionisation enthalpy.
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