Central atom

(Polar molecules, Non-polar molecules, etc.)

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Kelly Zhang 1L
Posts: 31
Joined: Fri Sep 28, 2018 12:18 am

Central atom

Postby Kelly Zhang 1L » Tue Nov 27, 2018 11:46 am

For the lewis structures, how do we determine which atom is the central atom?

RachaelKoh3A
Posts: 33
Joined: Fri Sep 28, 2018 12:25 am

Re: Central atom

Postby RachaelKoh3A » Tue Nov 27, 2018 11:53 am

Generally, the central atom is the atom that has the lowest ionisation energy. Ionisation energy increases across a period and decreases down a group.

Nikitha_lakshminarayanan3I
Posts: 30
Joined: Fri Sep 28, 2018 12:24 am

Re: Central atom

Postby Nikitha_lakshminarayanan3I » Tue Nov 27, 2018 12:24 pm

It is dependent on the ionization energy, however there are some exceptions. The book lists those.

Catherine Kim 3K
Posts: 31
Joined: Fri Sep 28, 2018 12:26 am

Re: Central atom

Postby Catherine Kim 3K » Tue Nov 27, 2018 1:26 pm

Generally the atom with the lowest ionization energy is the central atom.

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Central atom

Postby Cameron_Greenberg_3C » Fri Dec 07, 2018 5:24 pm

The atom with the lowest ionization energy is in the center. I usually look for which atom is furthest to the bottom left of the periodic table. If there is only a single atom bonded to multiple of a different atom, then the single atom will be central. ex: NH3 has nitrogen in the center

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Central atom

Postby Rosha Mamita 2H » Fri Dec 07, 2018 5:41 pm

The atom that has the lowest ionization energy will be at the center, though there are exceptions. For example, hydrogen will never be a central atom


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