effective nuclear charge

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Erica Li 1C
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Joined: Fri Sep 28, 2018 12:17 am

effective nuclear charge

Postby Erica Li 1C » Sat Dec 08, 2018 12:04 pm

I'm still kind of confused on what exactly effective nuclear charge is as well as what its trend is in the periodic table?

Atul Saha 3D
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Re: effective nuclear charge

Postby Atul Saha 3D » Sat Dec 08, 2018 1:59 pm

Effective nuclear charge is the amount of attraction the nucleus exerts on an electron; alternatively it is how strong of a positive force the electron experiences. The trends are that it increases across a period because there is a larger number of protons with no increase in electron shielding, and it decreases down a group because the atoms get bigger.

Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

Re: effective nuclear charge

Postby 605168557 » Sat Dec 08, 2018 5:08 pm

ENC refers to the net positive charge of the protons in the nucleus acting on the valence electrons. It is always less than the number of protons present in the nucleus because of the shielding effect (decrease in attraction) where the more electron shells there are, the greater the shielding effect will be. ENC increases across a period and down a group.

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