Which properties of element depend on the electronic configuration of atoms and which do not (b) Why the chemical properties of a group are similar Why do they not have identical properties (c ) Account for the great chemical similarity of the lanthanoid elements (Z =57 to 71) (d) Select the largest species in each group (i) `Ti^(2),Ti^(+3)` (ii) `F^(Θ),Ne,Na^(o+)` (e) Select the species with the largest `IE` in each group (i )`na,K,Rb` (ii) F,Ne,Na (f) Which ion has the smallest radius `Li^(o+),Na^(o+),K^(o+) Be^(+2), Mg^(+2)` (g) Select among the element that has the lowest and highest IE `K, Ca, Se, B, Kr`, (h) The ionic radii of `S^(2-)` and `Te^(2-)` are and 220 pm respectively Predict the ionic radius of `Se^(2-)` and for `p^(3-)` (i) In the ionic compound `KF` the `K^(o+)` and `F^(o+)` have practically identical radii, about 134 pm each. Predict the relative atomic radii of 1`K` and `F` .

Which properties of element depend on the electronic configuration of

1.	Which properties of element depend on the electronic configuration of atoms and which do not (b) Why the chemical properties of a group are similar Why do they not have identical properties (c ) Account for the great chemical similarity of the lanthanoid elements (Z =57 to 71) (d) Select the largest species in each group (i) `Ti^(2),Ti^(+3)` (ii) `F^(Θ),Ne,Na^(o+)` (e) Select the species with the largest `IE` in each group (i )`na,K,Rb` (ii) F,Ne,Na (f) Which ion has the smallest radius `Li^(o+),Na^(o+),K^(o+) Be^(+2), Mg^(+2)` (g) Select among the element that has the lowest and highest IE `K, Ca, Se, B, Kr`, (h) The ionic radii of `S^(2-)` and `Te^(2-)` are and 220 pm respectively Predict the ionic radius of `Se^(2-)` and for `p^(3-)` (i) In the ionic compound `KF` the `K^(o+)` and `F^(o+)` have practically identical radii, about 134 pm each. Predict the relative atomic radii of 1`K` and `F` .
Answer» Cemical and many physical properties depend on electonic cofiguration, but nuclear properties do not (b) Their properties are similar because of similar outermost electrnic configurations . The differnces are due to their differences in size and the magnitude of shielding effect (c) Their outermost two shells of electrons are alike `(6s^(2)5d^(1-))` or that configuration is very close to the ground state in stability Moreover all the the lanthanides act as if they had this configuration to a great extent (d) Ti (ii) `F` (e) Na (ii) Ne (f) `Be^(2-)` Be is a second period element, thus smaller than the higher period elements. The `Be^(2+)` ion is isoelectronic with `Li^(o+)` but has a greater nuclear charge (g) K has the lowest `IE` Kr has the highest IE increases along period `(rarr)` being very small for alkali metals and very large for the noble gases (h) Ionic radius of `Se^(2-)` is the average of those of `S^(2-)` and `Te^(2-)` that is `202 `pm The actual value is `198 pm` The expected radius of `P^(3-)` to be greater than that of `S^(2-)` since two ions are isoelectronic but `P` has one less proton Its actual radius is 212 pm (i) The atomic radius of `K` should be much greater than 134Pm and that of `F` much smaller since atomic cations are smaller than their parent atoms, while atomic anions are bigger than their parents The observed atomic radius of `K` and `F` are `231` and 64 pm respectively .

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