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the reactivity of an element is directly proportional to its size or is it inversly proportional to its size ?

the reactivity of an element is directly proportional to its size or is it inversly proportional to its size ?

Grade:10

2 Answers

Mahima Kanawat
1010 Points
6 years ago
Dear student ....Reactivity of an element is inversely proportional to its ionization energy. The elements which readily loose electron ( low ionization energy)are more likely to react fast..... but ionization energy is inversely proportional To size because atoms with bigger size loose electron fast hence we can say that reactivity is directly proportional to size..... With Regards ... Mahima (Askiitians Forum Expert )
Akachdeep Medhi
89 Points
6 years ago
See size[radius] of an element is inversely proportional to its reactivity.
We know, 
F=q1*q2/r^2 [where q1 and q2 are the two charges and r is the distance between them] 
 
So, with the increase in radius of the element the distance between the nucleus [proton] and the valence electrons inceases.
thus, reducing the Zeff [effective nuclear charge].
So, due to this that atom will easily lose electrons to gain the noble gas configuration.
 
Now,
If we consider an atom of another element with same no. of shells as the first one but more Z [atomic no.]
then the atomic radius will be smaller due to increase in no. of charges [both protons and electrons].So, it will lose electrons less readily as the first one.Thus, the reactivity is comparatively less
 
So, if this answer is helpful to you, then please kindly approve this answer.
With regards Akash

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