Classification of Elements and Periodicity in Prop

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Option (i)

As across the period the atomic radius decreases due to the increase of effective nuclear charge.

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The characteristics properties of p-block elements are as follows:-

(i) It contain metals, nonmetals and metalloids

(ii) Mostly involved in covalent bonding

(iii) Some elements show variable oxidation state

(iv) It possesses relatively higher ionization enthalpy compared to the s-block elements.

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(i) C has the highest ionization energy among the given elements as along the period ionization enthalpy increases whereas it decreases down the group.

(ii) Al is the most metallic element among the given elements because down the group metallic character increases

This is a Short Answer Type Questions as classified in NCERT Exemplar

This is a Short Answer Type Questions as classified in NCERT Exemplar

This is a Short Answer Type Questions as classified in NCERT Exemplar

Transition elements are named so because they form a bridge between s-block elements and p-block elements. Zn, Cd and Hg are among those elements that are dblock elements but they do not exhibit most of the properties of transition elements.

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As the atomic size of F is much smaller which leads to high e^- - e ^- repulsion upon addition of electrons thus its electron gain enthalpy is less than that of Cl.

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Ans: As we move across the periodic table the ionization energy increases because of the increase in the effective nuclear charge and decrease of the shielding effect as more and more electrons get added in the same orbital.

Thus group 1 has lower ionization enthalpy compared to that of group 17 and also group 1 by losing one electron it will acquire the nearest noble gas electronic configuration which also contributes towards its lower ionization enthalpy.

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The following points make long form of periodic table better than Mendeleev's periodic table :-

(a) It is a periodic function of atomic number

(b) Elements are grouped as per there outermost electronic configuration

(c) Proper segregation of metals and non-metals

(d) More appropriate position of group VII.