My logic is:
The atomic radius decreases across a period. As the atomic radius decreases, the atom will lose its capability to take in more electrons as compared to a group. So it should be more electropositive.
help.
Why electronegativity of elements increase in a period from left to right?
2016-07-01 4:51 pm
回答 (1)
2016-07-01 5:18 pm
Electronegativity is a measure of the ability of an atom to attract bond-pair electrons. Electronegativity is not related to taking in electrons.
Across a period from left to right, electronegativity increases, as bond-pair electrons are attracted more strongly by the nucleus. This is because across the period
1. the nuclear charge is increasing; and
2. the screening effect is nearly unchanged as there are the same number of inner electronic shells; and
3. the atom size is decreasing and thus the distance between the nucleus and the bond pair electrons is decreasing.
Across a period from left to right, electronegativity increases, as bond-pair electrons are attracted more strongly by the nucleus. This is because across the period
1. the nuclear charge is increasing; and
2. the screening effect is nearly unchanged as there are the same number of inner electronic shells; and
3. the atom size is decreasing and thus the distance between the nucleus and the bond pair electrons is decreasing.
收錄日期: 2021-05-01 13:06:48
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