All the elements, on the basis of long form of periodic table, can be divided into four blocks, s, p, d and f. The ionization energies, electron affinities, electronegativities, atomic and ionic radii

Question

All the elements, on the basis of long form of periodic table, can be divided 
into four blocks, s, p, d and f. The ionization energies, electron affinities, 
electronegativities, atomic and ionic radii and other physical properties 
usually shown a regular pattern of change within a group or along period with 
some irregularities.

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Understand that electropositive character (metallic character) increases moving down a group and decreases moving from left to right across a period. Step 2: Alkali metals (Group 1) are always more electropositive than alkaline earth metals (Group 2) within the same period due to lower ionization energies. Step 3: Among the choices, [He] 2s1 (Lithium) and [Xe] 6s1 (Cesium) are alkali metals. Since Cesium is much further down Group 1 than Lithium, its outermost electron is most easily lost, making [Xe] 6s1 the configuration of the most electropositive element.

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