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electronegativity trend

Posted: Thu Nov 07, 2019 10:05 pm
by connie 2C
why does the trend in electronegativity increase when you go up a column and increase when you go to the right in a row?

Re: electronegativity trend

Posted: Thu Nov 07, 2019 11:50 pm
by Lindsey Chheng 1E
connie 3K wrote:why does the trend in electronegativity increase when you go up a column and increase when you go to the right in a row?

Electronegativity is the ability for an atom to attract an electron. From top to bottom, electronegativity decreases since there is an increase in the distance between the nucleus and the valence shell. From left to right, electronegativity increases because atoms on the right have a higher nuclear charge (due to more protons) and are closer to achieving a full octet.

Re: electronegativity trend

Posted: Fri Nov 08, 2019 12:27 pm
by Eunice Nguyen 4I
For across a period: if the valence shell of an atom is less than half full, it requires less energy to lose an electron than to gain one. Similarly, if the valence shell is more than half full, it is easier to pull an electron into the valence shell than to donate one.
From top to bottom down a group, electronegativity decreases, because atomic number increases down a group, and thus there is an increased distance between the valence electrons and nucleus, or a greater atomic radius.

Re: electronegativity trend

Posted: Fri Nov 08, 2019 12:48 pm
by Miriam Villarreal 1J
The positively charged protons in the nucleus attract the negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity or attraction will increase. Therefore electronegativity increases from left to right in a row in the periodic table