Which element at center of the structure

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405398682
Posts: 26
Joined: Wed Sep 18, 2019 12:21 am

Which element at center of the structure

Postby 405398682 » Sun Nov 03, 2019 8:00 pm

How do I know which element is the center besides Carbon?

KarineKim1L
Posts: 47
Joined: Fri Aug 30, 2019 12:16 am

Re: Which element at center of the structure

Postby KarineKim1L » Sun Nov 03, 2019 8:01 pm

I believe the least electronegative element goes in the middle.

katrinawong3d
Posts: 40
Joined: Sat Aug 17, 2019 12:17 am

Re: Which element at center of the structure

Postby katrinawong3d » Sun Nov 03, 2019 8:02 pm

The most electronegative element goes in the middle.

Alison Trinh 1A
Posts: 48
Joined: Thu Jul 25, 2019 12:16 am

Re: Which element at center of the structure

Postby Alison Trinh 1A » Sun Nov 03, 2019 8:04 pm

The element with the lowest ionization energy or the element with the least electronegativity is the central atom.

504939134
Posts: 49
Joined: Wed Sep 18, 2019 12:21 am

Re: Which element at center of the structure

Postby 504939134 » Sun Nov 03, 2019 8:06 pm

The element with the lowest ionization energy will always be in the middle, but hydrogen will never be in the middle. Just look at your periodic table and remember that the ionization energy increases as you go across the periodic table (left to right)

Sean Tran 3D
Posts: 35
Joined: Sat Aug 17, 2019 12:17 am

Re: Which element at center of the structure

Postby Sean Tran 3D » Sun Nov 03, 2019 8:12 pm

The least electronegative atom is placed in the center of the electron structures, with the exception of Hydrogen, which will never be in the center.

Julie_Reyes1G
Posts: 41
Joined: Sat Jul 20, 2019 12:16 am

Re: Which element at center of the structure

Postby Julie_Reyes1G » Sun Nov 03, 2019 8:14 pm

Hi!
There are two main factors that can help you guess which element is in the center of a structure.
a. Symmetry- Most compounds tend to be as symmetrical as possible. For a compound such as CH4, C would be the central atom rather than any of the four H atoms.
b. Electronegativity- The element with the least electronegativity tends to be in the center. Electronegativity is basically of an atom's ability to pull in electrons. Central atoms usually have to share most of their electrons, while peripheral atoms can hold on to their electrons more tightly as lone pairs. Thus, highly electronegative elements are usually not the central atoms.
Hope this helps!


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