arrange the elements in increasing order of their size F-,Li+ ,Na+ ,Cl-
Answers
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Explanation:
Cl- is greatest among them. Because it is an anion. Size of anion is greater because after gaining an electron repulsions between electrons in last shell increase, which lead to increased size. Now there are two anoins, F- & Cl-. Lets write electronic configuration of both.
F 1s2 2s2 2p5
F- 1s2 2s2 2p6
Cl 1s2 2s2 2p6 3s2 3p5
Cl- 1s2 2s2 2p6 3s2 3p6
Now chloride ion has more value of principle quantum number, therefore it will be bigger than fluoride ion.In such a series, size decreases as the nuclear charge (atomic number) of the ion increases. The atomic numbers of the ions are S (16), Cl (17), K (19), and Ca (20). Thus, the ions decrease in size in the order: S2- > Cl– > K+ > Ca2+