3 and 4 3) The atomic radius of main-group elements generally increases down a g

Question

3 and 4

3) The atomic radius of main-group elements generally increases down a group because 3) A) effective nuclear charge decreases down a group B) effective nuclear charge zigzags down a group C) the principal quantum number of the valence orbitals increases D) effective nuclear charge increases down a group E) both effective nuclear charge increases down a group and the principal quantum number of the valence orbitals increases 4) 4) The ion with the smallest diameter is A) I- B) Br D) 02- 5) is expected to have the smallest distance between ion C) K2S 5) Of the ionic compounds below, centers (cation and anion centers). NOTE: refer to charts shown below E) RbF A) RbCI B) KF D) SrBr2

Explanation / Answer

3) as we go down the group an additional valence shell is added with increase in principle quantum no . so , the answer is C . hence the radius increases down the group as an additional shell keeps on adding .

4) F- is smaller than all the other anion as all anions have additional valence shells due to which its size increases .

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