Barium +2 has largest ionic radius because atomic number of barium is 56 which means that the shape of barium is lager than that of Ca+2 , Mg+2 !!
Which ion is larger Ca2+ or Mg2+?
Cations are smaller than their parent atoms, and so the Ca2+ ion is smaller than the Ca atom. Because Ca is below Mg in group 2A of the periodic table, Ca2+ is larger than Mg2+. Consequently, Ca > Ca2+ > Mg2+.
Which is larger Ca or Ca2+?
the amount of protons increases and because protons gravitate towards the nucleus, elements with greater atomic numbers have smaller atomic radii. … Ca is larger than the Ca2+ because Ca2+ has a greater positive charge and electrons repel the nucleus.
Which ion has the largest ionic radius?
Explanation: The ionic radii of cations follow the same trends as atomic radii. They increase from top to bottom and from right to left in the Periodic Table. Thus, the ion with the largest radius is closest to the lower left corner of the Periodic Table, and that is the K+ ion.
Does mg or Mg2 have a larger radius?
Answer. So Mg atom will be larger as it has more electrons than Mg 2+ and thus will have larger atomic radii.
Is Br or Br bigger?
Br – will have the largest atomic size because Br- has one extra electron in its valence shell which due to its unbalanced negative charge will be repelled and hence the atomic radius of Br- will increase.
What is the ionic radius of Mg2+?
Metallic, Covalent and Ionic Radii(r)*
| Atom/Ion | r(pm) |
|---|---|
| Lu3+ | 86 |
| Mg | 160 |
| Mg2+ | 72 |
| Mn | 137 |
Which is larger F or Li+?
On gaining electrons , the size eventually increases due to increased electron-electron repulsion. Thus Anions are greater in size than Cations. So if we compare between the above , Na+ and Li+ are smaller than F- or Cl-. And among these two, Cl- is greater in size than F- , as the ionic radii increases down the group.
Is Ca2+ smaller than AR?
Ca2+ vs. Ar: Ca has a +20 nucleus, Ar’s is +18. Thus Ar will have a smaller Zeff (=+18-10 = +8 vs. +20 – 10 = +10 for Ca2+) and a larger radius.
Which is larger S2 or Ca2+?
For a) the neutral Ca atom has a larger radius than the Ca2+ ion. This is because the loss of electrons reduces the shielding effect between the electrons and the nucleus, so the attraction of the nucleus for the electrons is greater, reducing the radius. For b) S2− has a larger radius than the neutral S atom.
Why is K bigger than Br?
Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.
Which ion has the smallest ionic radius?
Because K + has the greatest nuclear charge (Z = 19), its radius is smallest, and S 2− with Z = 16 has the largest radius.
What is the radius of Mg2+?
As the ionic radii of Mg2+ (0.65 A), Cu2+ (0.73 A) and Ni2+ (0.72 A) are appreciably smaller than Ca2+ (0.99 A), it appears that the Mn2+ binding site is more accessible to Mg2+, Cu2+, and Ni2+ as compared to Ca2+, the ionic radius of Mn2+ being 0.80 A.
Which is smaller Na+ or Mg2+?
mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus. …
Do you predict that the ionic radius of Sr2+ is larger or smaller in size than the ionic radius of Mg2+?
Hence, from the electronic configuration of Mg2+ ( [He]) and that of Sr2+ ([Kr]), the Sr^2+ ion is much larger and has many more intervening shells than Mg2+. Hence it follows that as we move down group 2, we expect that the ionic radius should increase in accordance with the reason given above.