Question

Which of the following species has the largest and the smallest size ?

$\to \bold{Mg \: , \: {Mg}^{ \: 2 + } \: , \: Al \:, \: {Al}^{ \: 3 + } }$
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Answer 1

largest-(Mg,Mg^2+),smallest-(Al,Al^3+) is the answer( please mark as brainliest. )

Answer 2

Answer:

Mg > Al > Mg²⁺ > Al³⁺

Explanation:

We know that order of increasing size of atoms is:

Cations < Atom < Anions

Among the cation and atoms, the element with less nuclear charge has larger charge.

Hence Mg has less nuclear charge than Al. Therefore Mg has greater size than Al.

Similarly, Mg²⁺ has less nuclear charge than Al³⁺. Thus Mg²⁺ > Al³⁺

So the correct order is Mg > Al > Mg²⁺ > Al³⁺

Nuclear charge refers to the force of attraction of nucleus on the valence electrons.

Hope it helped !!