Question

Which of the following (anions/atom/cations) has the smallest radius? S2- Cl- Ar K+ Ca2+

a. S2-

b. Cl

c. Ar

d. K+

e. Ca2+

Answer 1

Correct option is e Ca2+ explanation is given below

....... . - which of the following canions/atom Ications) has the smallest radius 2. 52, cr, Ar, kt, ce?t => cat Ezeplanation : " All five anions I atom Ications have equal number of electrons - f therefore share the same electronic configuration. 23 ay 5²- for neutral s (1 = 16), it gains 2 ē to form s2 anion that contuins 16+2 = 18 electrons. biel for neutral c122=17) it goins le to form clanon that contains 17+1 = 18 elections. as Ar is a neutrey (2=18) contains is electrons. dj kt for neutral K (2=19), it loses te to form - kt cation that contains 191= 18 electrons e) cazt for neutral ca (2=20), it loses zē to form ca 2t cation that containg 20-2 =18 eleetons 3) +ve charged Poutons in nulei attraet -ve charged @cloud - & cach proton corries tl charge, the more protons an ahom orion contains strong attruction it poses its e cloud W A nucleus of strong the charge Pulls its electron cloud towards itself tightly such that would have s) order Crank) of smallest to largest radius is ca2t, Kt, Ar, cl, 3² l.2. increasing order is. - ca² tktlar<ci<S²- b) Henee smallest gasius caution is cartof option ei h that would have small radius. te option e is correct.