What explains why electronegativity increases as you move across a period? Does it have something to do with the shielding effect of added electrons?


*

*

The electronegativity is the tendency of an atom or a functional group to attract electrons (or electron density) towards itself.

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

This is because the attraction of bonding electrons by an atom increases with nuclear charge (Atomic Number) and decrease of atomic radius. Both these factors operate as we move to the right in period.

Does it have something to do with the shielding effect of added electrons?

The electron cloud in the inner orbits act as a shield and reduces the nuclear attraction to the outer orbits. Because of the shielding effect, the tendency of nuclear attraction reduces and thus electronegativity reduces.


Share
Improve this answer
Follow
answered Nov 25 "13 at 6:15
*

ashuashu
3,33711 gold badge1717 silver badges3333 bronze badges
$\endgroup$
Add a comment |
5
$\begingroup$
ashu"s answer is good, but it does not get to the real reason that electronegativity increases across periods. Electronegativity is dependent on other properties that are more intuitively dependent on position within a period.

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

$$\chi_A = (E_{i,A}+E_{ea,A})/2$$

These values behave in a predictable manner related to the effective nuclear charge idea ashu mentions. Consider the data from the second period (all values in kJ/mol):


Share
Improve this answer
Follow
answered Nov 26 "13 at 16:09
*

Ben NorrisBen Norris
41k88 gold badges112112 silver badges170170 bronze badges
$\endgroup$
0
Add a comment |
0
$\begingroup$
Across the period, electronegativity increases. This is mainly due to the increase in effective nuclear charge. As the number of core electrons remain constant, the number of protons increases. The protons actually draw those electrons closer to the nucleus.


Share
Improve this answer
Follow
answered Feb 9 "16 at 22:42
*

Matthew LeeMatthew Lee
1
$\endgroup$
1
Add a comment |
0
$\begingroup$
Along a period the effective nuclear charge increases thus decreasing the atomic radius. This favours the increase in electronegativity and therefore it increases along a period from left to right.


Share
Improve this answer
Follow
answered Jun 3 "16 at 9:47
D dahiyaD dahiya
1
$\endgroup$
Add a comment |
0
$\begingroup$
Electronegativity means tendency to attract electron,along the period atomic size decreases,atomic size decreases means there is more attraction of nucleus towards electron,more attraction of nucleus means there is more positive charge,and more positive charge means there is more tendency to attract electron.thus electronegativity increases.


Share
Improve this answer
Follow
answered Feb 15 "18 at 2:23
Priyanka HazarikaPriyanka Hazarika
1
$\endgroup$
Add a comment |
0
$\begingroup$
Well the electronegativity increases across the period because the electrons are being added onto the same energy level,this increases the number of electrons of an atom,the increase of electrons of an atom also leads to increase in clear charge,in fact the nuclear charge increases more,this leads to attraction of electrons by the nuclear charge,hence electrons get attracted towards the nuclear charge hence electrons are not easily lost!


Share
Improve this answer
Follow
edited May 18 "19 at 8:16
user7951
answered May 18 "19 at 8:14
Hanani MichealHanani Micheal
1
$\endgroup$
Add a comment |

Your Answer


Thanks for contributing an answer to smashville247.net Stack Exchange!

Please be sure to answer the question. Provide details and share your research!

But avoid

Asking for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.

Use MathJax to format equations. MathJax reference.

To learn more, see our tips on writing great answers.

See more: How Much Money Does An Atm Machine Hold, How Much Money Is In An Atm


Draft saved
Draft discarded

Sign up or log in


Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Submit

Post as a guest


Name
Email Required, but never shown


Post as a guest


Name
Email

Required, but never shown


Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy


Not the answer you're looking for? Browse other questions tagged periodic-trends or ask your own question.


Featured on Meta
Linked
0
Why does electronegativity generally increase across a period?
Related
36
Why do atoms generally become smaller as one moves left to right across a period?
7
Why does attractive forces of nucleus increase more than shielding across groups?
5
Why does ionization energy increase as we go from left to right in a period?
1
Periodic Trends of Zeff and Electronegativity
1
Does increasing electronegativity imply more covalent character?
1
Why does hydride acidity increase across period and down group in periodic table?
7
Why is the electronegativity of indium greater than that of thallium?
Hot Network Questions more hot questions

Question feed
Subscribe to RSS
Question feed To subscribe to this RSS feed, copy and paste this URL into your RSS reader.


smashville247.net
Company
Stack Exchange Network
site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. rev2021.10.13.40448


smashville247.net Stack Exchange works best with JavaScript enabled
*

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.