Question

For each of the following pairs of atoms or ions, state which you expect to have the larger radius.

(a)   Se or Ca
(b)   Ca or Ca2+
(c)   Ca2+ or Ar
(d)   F or I
(e)   Ar or S2-

Answer 1

a) se or ca As we move from left to right in the periodic table is the same period the abouinc radius decreases. As ca and se are present in the same period (4th), and se is present much right to ca. 8. ca will have largest abonic radius.

6) Ca or Ca2+ As the no. of electrons un caut es less than than the no. of eleeftions in ca, the effective nuclear charge for laat increases (as shelding effect of electrons decreases due to less electrons) and it gets smaller in sire. do a us* u kа bляо» оtоміг паѓк. c) cant or Ar As two electrons are less ir alt ions, so the effective nullear charge increase and the size decreases, although the no. of deetcons. in both is 18, but no. of pretons in cat is 20 and in Az 18. во (24 usu how lekt Oud AX tuka have larger alonur radius. . d) for I As F and I are present in the same group, and when we move down en a group the alonuc. radias increases, as I es present down than F, so I wire have larger alone radius.

1) Дя 0% с?- Both Ar and genaue the soune no. of electroni that is 18, but in case of s the no. of. protons is 16 only and in Ar it is 18. So, Не есік шйил и еk chase a g?" is less than All. do sat will have larger abonne Radics than Ar.