Question

arrange H+ ,H- , H in the decreasing order of their size​

Answer 1

Answer:

H+ > H > H- anions are smaller than cations

Answer 2

H-  >  H  >  H+

Size of anion > Neutral atom > Cation

As effective nuclear charge experienced by an electron of cation

> Neutral atom > anion size is inversely proportional to effective nuclear charge.

The decreasing order  of size is : H- > H > H+

• H has 1 electron & 1 proton. If the one more electron is added to  shell, then effective nuclear charge per electron will decrease &  hence electron cloud tends to move away from attractive positive charge & hence, radius increases as compared to parent atomic radius.

• On other side, when  only electron of the  H is removed, single proton is left in atom solely having the positive charge.

• There is no electron cloud,  to move away. It tends to contract &  therefore it's radius decreases as compared to parent atomic radius.

Therefore ,

Decreasing order of their size​  : H- > H > H+   .

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