During reaction of metals and non-metals, metal atoms tend to loose electrons and non-metal atoms tend to gain electrons. This transfer of electrons has a predictable offect on the size of the ions that form, and that predictable effect on the size is called the ionic size.
Ionic size is the size of the atom after it loses its outermost electron (after the first Ionization Energy)
Ionic size increases from top to bottom within the group.
why the ionic radii of negative ions are larger than the size of their parent atoms?
I think it depends what the magnesium is built into.
The smaller size of cation (as Li+) and larger size of anion (as I-) is the main cause for the covalent character in ionic compound.
In ZnO, Znic (Zn++) ionic radious is 74 pm while Oxygen(O2-) inoc radious is 126pm. As the ionic radious is large of the oxygen atom. So oxygen size is bigger than Zn size.
282 picometers Source: Wikipedia/ionic radius
Lithium is a good conductor in its normal ionic state but in aqueous solutions, it forms very large molecule by attracting lots of water ions to itself. Its ionic size in aqueous solution is even greater than the size of cesium ion in water. This increased ionic size in aqueous solution reduces its mobility in the solution and reducing its conductivity.
The number of subshells increases, so the radius of the atoms get larger.
Both trends hold for both positive and negative ions.
- nuclear charge - number of electrons - orbitals in which the electrons reside
Only the value for the covalent radius is known now: 260 pm.
Because electrons are gained.
Molecules move in and out of the cell by difffusion process and only those molecules which have size smaller then pore size of plasma membrane can move in and out of the cell. The second factor is ionic conc or is also known as conc gradient according to which molecules of required ionic status can move in and out of the cell
anions always gain extra electrons casing the ionic radius to increase but cations remove electrons causing the ionic radius to decrease .therefore anionic radius is greater than cationic radius
Ionic hair dryers employ negatively charged ions that break down wet water into molecules and reduce them to a fraction of their size. The benefits of using an ionic hair dryer include that it works much better and it dries hair much faster.
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