Decrease across a period

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Jimmy lira-1G
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Joined: Fri Apr 06, 2018 11:03 am

Decrease across a period

Postby Jimmy lira-1G » Wed May 02, 2018 2:05 pm

Why do the elements in the periodic table cause a decrease across a period of ionic radius? I understand they decrease, but why do the specific elements cause this ?

-Jimmy Lira 1G

Chem_Mod
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Re: Decrease across a period

Postby Chem_Mod » Wed May 02, 2018 5:44 pm

As the you move down the same period, number of protons in the nucleus increase and thus generate a stronger force that draws the outer electron shell inwards. This thus result in a smaller radius.

Kate Manganaro 1F
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Joined: Fri Apr 06, 2018 11:03 am

Re: Decrease across a period

Postby Kate Manganaro 1F » Wed May 02, 2018 10:18 pm

The reasoning primarily has to do with the amount of protons. As you move across the periodic table the atomic number gets higher, for example, Oxygen=8, Fluorine=9, and Neon=10. These numbers directly correlate with the number of protons in the nucleus. Because opposites attract, the more positive charge of the nucleus would then pull the negatively charged electrons closer to the nucleus. Hope this helps!

Andre-1H
Posts: 39
Joined: Fri Apr 06, 2018 11:01 am

Re: Decrease across a period

Postby Andre-1H » Sun May 06, 2018 5:27 pm

I think also that because as you go across a period there are more valence electrons, this also attracts it towards the increasing amount of protons. More negative particles on the outermost part of the atom become attracted with a stronger force to the increased amount of positive protons in the nucleus, thus decreasing the radius of the atom


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