1.- Which of the following ions is isoelectronic withKr? a) Ru 2+ b)Cl - c)I - d

Question

1.- Which of the following ions is isoelectronic withKr? a) Ru2+    b)Cl-    c)I-     d)In3+    e) Sr2+ 2.-Which of the following elements has the smallest firstionization energy? a) Br   b) K    c) Mg   d)Rb    e) Sb 1.- Which of the following ions is isoelectronic withKr? a) Ru2+    b)Cl-    c)I-     d)In3+    e) Sr2+ 2.-Which of the following elements has the smallest firstionization energy? a) Br   b) K    c) Mg   d)Rb    e) Sb 2.-Which of the following elements has the smallest firstionization energy? a) Br   b) K    c) Mg   d)Rb    e) Sb

Explanation / Answer

1)isoelectronic means having same no of electrons here Kr has atomic no = 36 now, Ru2+ has = 44-2                          =42         Cl- has = 17 +1                        =18             I-  has = 53 +1                      = 54           In3+   has = 49-3                          = 46            Sr2+ has = 38-2                              =36 so Sr2+ has same no of electrons as presentin Kr so answer is a) 2.)Electrons in the closer orbitals experience greater forcesof electrostatic attraction; thus, their removal requiresincreasingly more energy. so their ionization energy is more. (lowest ionization energy would be the atom with the weakestbonding on the outer most atom due to distance from nucleus as wellas shielding by other e's) So the element closest to the lower lefthand corner has the lowest ionization energy. here its Rb so answer is d)

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