What describes why electronegativity increases as girlfriend move throughout a period? does it have actually something to execute with the shielding effect of added electrons?


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The electronegativity is the propensity of one atom or a functional group to lure electrons (or electron density) towards itself.

You are watching: Electronegativity increases as the size of the atom increases.

This is since the attraction of bonding electron by an atom boosts with nuclear charge (Atomic Number) and also decrease of atom radius. Both these factors operate as we relocate to the right in period.

Does it have actually something to carry out with the shielding impact of added electrons?

The electron cloud in the inside orbits act as a shield and also reduces the nuclear attraction to the external orbits. Since of the shielding effect, the propensity of nuclear attraction reduces and also thus electronegativity reduces.


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answer Nov 25 "13 in ~ 6:15
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ashuashu
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ashu"s answer is good, but it go not gain to the actual reason that electronegativity increases throughout periods. Electronegativity is dependency on other properties that are much more intuitively dependent on position within a period.

The absolute (Mulliken) electronegativity $\chi$ (which correlates through the an ext familiar, but much more abstract, Pauling electronegativity) of one atom is the arithmetic mean of its very first ionization energy and its an initial electron affinity

$$\chi_A = (E_i,A+E_ea,A)/2$$

These values behave in a predictable manner pertained to the reliable nuclear fee idea ashu mentions. Consider the data indigenous the second period (all values in kJ/mol):


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reply Nov 26 "13 at 16:09
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Ben NorrisBen Norris
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Across the period, electronegativity increases. This is mainly as result of the boost in effective nuclear charge. Together the number of core electrons continue to be constant, the variety of protons increases. The protons actually attract those electrons closer come the nucleus.


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answer Feb 9 "16 at 22:42
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Matthew LeeMatthew Lee
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Along a period the efficient nuclear charge increases therefore decreasing the atom radius. This favours the boost in electronegativity and therefore it boosts along a duration from left to right.


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reply Jun 3 "16 at 9:47
D dahiyaD dahiya
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Electronegativity method tendency to entice electron,along the period atomic dimension decreases,atomic size decreases way there is more attraction the nucleus in the direction of electron,more attraction that nucleus method there is an ext positive charge,and more positive charge method there is an ext tendency to entice electron.thus electronegativity increases.


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reply Feb 15 "18 at 2:23
Priyanka HazarikaPriyanka Hazarika
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Well the electronegativity increases across the period because the electrons space being added onto the same energy level,this boosts the variety of electrons of an atom,the rise of electrons of an atom likewise leads to boost in clean charge,in truth the atom charge increases more,this leader to attraction of electrons by the atom charge,hence electrons acquire attracted towards the nuclear charge therefore electrons room not quickly lost!


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edited might 18 "19 in ~ 8:16
user7951
answered might 18 "19 at 8:14
Hanani MichealHanani Micheal
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