एक्सप्लेन लंथनाइड कांट्रेक्शन विद रीजन
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Answer:
The lanthanide contraction is the greater-than- expected decrease in ionic radii of ... in smaller than otherwise expected ionic radii for the subsequent elements starting with 72, hafnium.
Explanation:
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Answer:
Lanthanide contraction is the gradual decrease in the atomic and ionic size of lanthanoids with an increase in atomic number.
Causes of lanthanide contraction:
With an increase in the atomic number, the positive charge on nucleus increases by one unit and one more electron enters same 4f subshell.
The electrons in 4f subshell imperfectly shield each other. Shielding in a 4f subshell is lesser than in d subshell.
With the increase in nuclear charge, the valence shell is pulled slightly towards the nucleus. This causes lanthanide contraction.
Explanation:
The steady decrease in the size of lanthanide ions with the increase in atomic number is called lanthanide contraction. Consequences: There is not regular trend in ionization potential in the group due to lanthanide contraction. Similarity of 2nd and 3rd transition group.