Further, the d-orbitals of the transition element project to the periphery of the atom more than the s and p-orbitals. Hence the d-electrons effect the properties of the elements to a great extent.Thus ,ions with similar $d^{n}$ configuration $(n = 1 - 9$ have similar magnetic and electronic properties. In other words in the properties of transitions elements in addition to the trends in the properties.

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Solution

Periphery means boundary, so the d-orbitals is at the outermost orbital and are effected by the atoms and molecules surrounding. In other wise the properties of transition elements in addition to the trends in properties.

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Similar questions

Q. Further, the d-orbitals of the transition element project to the periphery of the atom more than the s and p-orbitals. Hence the d-electrons effect the properties of the elements to a great extent.

Q. Elements of the same group have similar valance shell electronic configuration. Hence they exhibit similar chemical properties. But elements of the same period have different valencies.

Comment on the above statement.

The statement that is not correct for periodic classification of elements is
(a) The properties of elements are the periodic function of their atomic numbers
(b) Non-metallic elements are less in numbers than metallic elements
(c) For transition elements, the 3d orbitals are filled with electrons after 3 p - orbitals and before 4s orbitals
(d) the first ionization enthalpies of elements generally increase with the increase in atomic number as we go along a period

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

Which among the given elements have similar chemical properties, as an atom of an element 'X' with an electronic configuration of 2, 8, 5?

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