Ncert Solutions Chemistry Class 11th

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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

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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 gro

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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 segre

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Mendeleev's arranged the elements as the periodicity of their atomic weights.

The drawbacks of Mendeleev's periodic table are as follows:-

(a) The position of hydrogen in the periodic table is not specified

(b) Isotopes are not inclu

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The group 1 elements are called alkali metals which possess outermost electronic configuration as ns1 .All the elements that have same outermost electron configuration possess similar properties and are placed in the same group.

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The chemical properties and physical properties of the elements depends upon its outer electron configuration which ultimately is the periodic function of the atomic number. The elements which possess the same outer electron configuration

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The amount of energy required to remove an electron from the outermost shell of an isolated gaseous atom in its ground state is said to be ionisation enthalpy.

The factors that affect ionization enthalpy of the elements are as follows:

(a)

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The factors that affects electron gain enthalpy are as follows:

(a) Effective nuclear charge with its increase the electron gain enthalpy also increases

(b) Atomic size with its increase the electron gain enthalpy decreases

(c) The e-e - r

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(i)→ (a), (d); (ii)→ (c); (iii)→ (a); (iv)→ (b)