Evaluation of global hardness of atoms based on the commonality in                 the basic philosophy of the origin and the operational significance of  the electronegativity and the hardness. Part I. The Gordy’s scale of electronegativity and the G.H.

Nazmul Islam; Dulal C. Ghosh

doi:10.5155/eurjchem.1.2.83-89.26

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Published: Jun 15, 2010

DOI: https://doi.org/10.5155/eurjchem.1.2.83-89.26

Keywords:

Commonality between electronegativity and hardness, Gordy scale of electronegativity, Scale of global hardness based on potential concept, Periodicity of global hardness of atoms

Section

Research Article

Issue

Vol. 1 No. 2 (2010): June 2010

Dates

Received 2010-03-31
Accepted 2010-04-30
Published 2010-06-15

Nazmul Islam

Department of Chemistry, University of Kalyani, Kalyani-741235, India

Dulal C. Ghosh

Department of Chemistry, University of Kalyani, Kalyani-741235, India

Abstract

Relying upon the fact that the hardness, like the electronegativity, is a qualitative property and there is commonality in the basic philosophy of the origin and the operational significance of these two fundamental descriptors of atoms in physics and chemistry, we have proposed to use the Gordy's ansatz, modified by Ghosh and Chakraborty, of evaluating electronegativity of atoms as the ansatz of measuring the global hardness of atoms in this work. The ansatz under reference computes the energy of attraction between the screened nucleus of the atoms and its valence electrons. This is our definition of electronegativity and global hardness of atoms. The evaluated new set of global hardness is found to satisfy the sine qua non of a reasonable scale of hardness by exhibiting perfect periodicity of periods and groups and correlating the gross physico-chemical properties of elements. The inertness of Hg and extreme reactivity of Cs and Fr atoms are nicely correlated. The chemical reactivity and its variation in small steps in the series of lanthanide elements are also nicely reproduced. The results of the present semi-empirical calculation find strong correlation with the results of some sophisticated DFT calculations for a set of atoms.

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Islam, N.; Ghosh, D. C. Evaluation of Global Hardness of Atoms Based on the Commonality in the Basic Philosophy of the Origin and the Operational Significance of the Electronegativity and the Hardness. Part I. The Gordy’s Scale of Electronegativity and the G.H. Eur. J. Chem. 2010, 1, 83-89.

Author Biography

Nazmul Islam, Department of Chemistry, University of Kalyani, Kalyani-741235, India

Snr Research scholar,Department of Chemistry
University of Kalyani
Kalyani-741235
India

Faculty of GERF(POST GRADUATE CENTRE)

University of Mysore

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