Which ion would you expect to have the smallest ionic radius? Ca2+ would have the smallest ionic radius because Calcium has a positive charge, and because this ion is a cation, cations will have the smallest radius. So therefore, elements with a positive charge, will have a smaller ionic radius.
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.
Which atom or ion has the smallest radius?
As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
Which of the following has smallest radius?
Hence, Cl has the smallest radius.
Does K+ or Ca2+ have a smaller radius?
Ca2+ has smaller ionic radius than K+ because it has more nuclear charge. In a given period, on moving from left to right, the nuclear charge increases without addition of shell. The increased nuclear charge attracts the electrons more strongly towards the nucleus. This decreases the ionic size.
How do you know which ion has the largest radius?
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.
Why is Fe2+ bigger than Fe3+?
Fe2+ will be larger than Fe3+. This is because the outermost electron in the Fe2+ ion is pulled off to form Fe3+ ion. As the electrons are removed, it reduces the repulsion increasing nuclear charge experienced by each of the other d electrons and decreases the size of the ion.
Which has largest radius?
Since the atomic radius decreases in a period but increases down the group so Sr of group II and period V is largest in size.
Which atom or ion is the largest?
We know when the no of protons (+ charge) are greater than the no of electrons (- charge), the nucleus pulls the electrons with greater force, hence making the size smaller. Clearly, the cations are smaller than the atoms, this largest atom/ion will be Ca.
Which has maximum ionic size?
Therefore, O2− is largest in size.
Which element in Group 2 has the largest radius?
Trends in Atomic Radius of Group 2 Elements
| name | atomic radius (pm) | Trend |
|---|---|---|
| magnesium | 160 | ↓ |
| calcium | 197 | ↓ |
| strontium | 215 | ↓ |
| barium | 217 | largest |
Which cation has the smallest radius?
Note trends for ionic radii: ionic radius of a cation is less than atomic radius of the atom. ionic radius of an anion is greater than atomic radius of the atom.
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Key Concepts.
| atomic radius decreases across a period from left to right | Li |
|---|---|
| Be | |
| B | |
| C | |
| N |
Which element has a larger atomic radius than phosphorus?
Atomic Radius of the elements
| Helium | 31 pm | 161 pm |
|---|---|---|
| Phosphorus | 98 pm | 183 pm |
| Selenium | 103 pm | 184 pm |
| Xenon | 108 pm | 185 pm |
| Silicon | 111 pm | 188 pm |
Which is larger K+ or Ca2+?
(d) K+ is larger than Ca2+ Isoelectronic; Ca2+ has more protons to pull e- inward.
Is BR 1 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.
Which is larger F 1 or F?
F-1 is larger than F because F has a greater positive charge and electrons repel the nucleus.