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Question

Explain the term:
(a) periodicity in properties of elements
(b) periodic properties
(c) periodicity of elements

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Answer

(a) Periodicity in properties of elements — The phenomenon of occurrence of characteristic properties of elements at definite intervals in the modern periodic table when elements are arranged in increasing order of their atomic numbers is called Periodicity in properties of elements.

(b) Periodic properties — The properties which appear at regular intervals in the periodic table are called periodic properties. Periodic Properties are:

  1. Atomic radii
  2. Ionization potential
  3. Electron affinity
  4. Electronegativity
  5. Non-Metallic and Metallic character.
  6. Density
  7. Melting and boiling points.
  8. Nature of oxides, oxy-acids, hydrides.

(c) Periodicity of elements — Gradual change in properties of elements when they are arranged in increasing order of atomic number in the periodic table is called the periodicity of elements.

💡 Some Related Questions

Periodic table

With reference to group 1 [IA] of the periodic table – fill in the blanks with the correct word:
The elements are …………… [light/heavy] …………… [metals/non metals] since their atomic size is …………… [large/small]. The energy binding the atoms is …………… [high/low] and hence the elements have …………… [high/low] melting points. The melting points of the elements …………… [increases/decreases] down the subgroup. The electropositive character …………… [increases/decreases] down the subgroup and the elements are strong …………… [reducing/oxidizing] agents. The element with electronic configuration 2, 8, 1 will have …………… [higher/lower] electron affinity and …………… [smaller/larger] atomic size than the element with electronic configuration 2, 1.

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Periodic table

In period 2, element ‘A’ is to the right of element ‘B’
(a) The element ‘A’ would probably have a …………… [smaller/larger] atomic size than ‘B’.
(b) The element ‘B’ would probably have …………… [lower/higher] ionization potential than ‘A’.
(c) The element ‘A’ would have …………… [lesser/higher] electron affinity than ‘B’.
(d) Nuclear charge of element ‘B’ would be …………… [less/more] than element ‘A’.
(e) If an element ‘C’ had a low electronegativity and ionization potential it would have more tendency to …………… [gain/lose] electrons.

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