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: B. Step 1: Determine the electronic configurations of beryllium (Be: 1s2 2s2), magnesium (Mg: 1s2 2s2 2p6 3s2), and calcium (Ca: 1s2 2s2 2p6 3s2 3p6 4s2). Step 2: Compare their outermost energy levels. All three elements have two s-electrons in their outermost shells, are classified as alkaline earth metals, and belong to group 2 of the periodic table. Step 3: Beryllium has only 4 electrons total, and its outer energy level (n=2) contains no p-orbitals or p-electrons. Therefore, containing a pair of p-electrons in the outermost energy level is not a shared characteristic.

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