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Why anion is larger than its parent atoms??

An anion is formed by the gain of electron by the parent atom.The number of protons remains the same in the anion as the parent atom and thus the nuclear force of attraction for the outer electrons reduces and hence the distance between nucleus and outer electrons increases due to which anion is larger than its parent atom.

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 because anions are formed by the addition of the electrons and parent atom is a neutral atom

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The size of an anion is larger than its parent atom because anions are formed due to the gain of electrons. When the electrons increase, there are still the same number of protons. The attractive force is thus reduced as there are the same number of protons attracting an increased number of electrons. This causes the electrons to not be bound as tightly to the nucleus resulting in an increase in size. 

In other words, anions have one or more extra electrons that contribute to the size of the atom. These extra electrons increase its size and make it larger than the neutral atom.
 
hope got ,, Sos ,, thubs up !
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 The size of an anion is larger than dat of the parent atom coz the addition of one or more electrons would result in increased repulsion among the electrond and a decrease in effective charge. For eg. the ionic radius of fluoride ion (F-) is 136 pm. whereas the atomic radius of fluorine is only 64 pm. on the other hand, the atomic radius of sodium s 186 pm compared to the ionic radius of 95 pm for Na+.

Hope its help U..... :)

 

thubs ?

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O-kay ImRaN.

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