Apr 10, 2023
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Hi im having my inorganic exam tomorrow and could you please help me with this question: Explain why anions are in general larger than cations. For example O2- is twice the size of Mg2+ although they have the same number of electrons ?
This is a topic which is similar to the concept of atomic radii, but when applied to ions it is the ionic radii of cations and anions.Put simply, when an atom loses electrons (to become cations) and its valence shell is depopulated, it shrinks in size. If the outer shell is not fully depopulated, the shrinking in size is due to less electron-electron repulsion, allowing for the positive charge of the protons to draw the electrons closer to the nucleus.Anions have extra electrons, which populate larger shells and increase the electron-electron repulsion. This causes the orbitals to swell up to accommodate these surplus negative charges (more can be read here)Sorry for replying too late for your exam, but in fairness we probably live in different time zones so … I hope it went well though
The radius, as we know, is the distance between the center of a circle to its circumference. The radius defines the area and the perimeter of the circle. The radius is associated not only with the circle but also with other geometrical shapes, like sphere, polygon, etc.
Clever Periodicity Table
My friend had her apple macbook out in our last chemistry lesson- because she's really cool like that and she found this really helpful table which I've been trying to make myself for ages :)
I'm not very good at the whole why bit and that's what they ask you so this is really helpful :D
I tried pasting it but the table disintegrated into words :'( But the link is here :)
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