K+, Cl−, and S2− form an isoelectronic series with the [Ar] closed-shell electron configuration; that is, all three ions contain 18 electrons but have different nuclear charges. Because K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius.
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.
Which ion has largest 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 is the largest ionic radius? Ion Radius (pm) Atomic Number N 3− 146 7 O 2− 140 8 F − 133 9 Na + 98 11.
Which has the largest radius O or O 2?
O2− is larger than O because the increase in electron repulsions that accompany addition of an electron causes the electron cloud to expand.
What is the radius of mg2+?
Metallic, Covalent and Ionic Radii(r)* Atom/Ion r(pm) Lu 172 Lu 3 + 86 Mg 160 Mg 2 + 72.
Is K+ bigger than P3?
Since potassium has the highest atomic number among the 5 species, K+ will have the smallest ionic radii while P3− will have the largest ionic radii.
Which ion has the largest radius se2 F O2 Rb+?
The answer is “Rubidium Rb+”.
Which has largest ionic size?
Thus, the ionic radius of Cs+ is the largest.
Is BR bigger than F?
Negative ions are bigger than the atoms they come from. Chlorine is 2,8,7; Cl– is 2,8,8. Although the electrons are still all in the 3-level, the extra repulsion produced by the incoming electron causes the atom to expand. vdW radius (nm) ionic radius of X – (nm) F 0.147 0.133 Cl 0.175 0.181 Br 0.185 0.196 I 0.198 0.220.
Which is larger in radius K+ or K?
The K+ ion has its outermost electrons on the third energy level now and is size is smaller than that of K ion. Hence, K is larger than K+.
Is Ca2+ or K+ bigger?
(d) K+ is larger than Ca2+ Isoelectronic; Ca2+ has more protons to pull e- inward.
Which is larger Se2 or Br?
The Br− ion is smaller than the Se2− ion because the Br− ion has a larger nuclear charge and more extra electrons than the Se2− ion.
Why is 02 bigger than F?
Explanation: From top to bottom of the periodic table ions will increase in radii. However, now left to right the radius is more of a function of the number of electrons. Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.
Which is bigger Mg2+ or Na+?
Does Mg2+ or Na+ have a smaller radius? The Mg2+ ion will have a smaller radius. Magnesium has one more proton than sodium, and therefore, with the same number of electrons and 1s orbital shielding, the Zeff for magnesium is greater, and therefore Mg2+ has the smaller ionic radius.
Which is larger P3 or N3?
Which is smaller P3 or N3? Answer. Answer: P3 – is larger radius than N3-.
Is K+ larger than Na+?
K+ is larger than Na+ because the ionic radius increases in a particular group on moving from top to bottom due to increase in the principle energy shell though the number or electrons in the valence shell remain the same.
Is S or S 2 bigger?
(ii) Explain why the radius of the S2- ion is larger than the radius of the S atom. This extra repulsion in the sulfide ion increases the average distance between the valence electrons, so the electron cloud around the sulfide ion has the greater radius.
Is O2 bigger than F?
Similarly, O2- will be larger than F- as both have 10 electrons but Z=8 for oxygen and Z=9 for fluorine.
Which is bigger SE or O?
Which one out of O and Se is bigger in size and why? Selenium has bigger atomic size because it comes after oxygen in the group (O, Se) and down the group size of atom increase.
Which ion has the smallest radius?
Because K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius. Because selenium is directly below sulfur, we expect the Se2− ion to be even larger than S2−.Ionic Radii and Isoelectronic Series. Ion Radius (pm) Atomic Number N 3 − 146 7 O 2 − 140 8 F − 133 9 Na + 98 11.
Is K+ smaller than Li+?
It can be seen that the ionic radius of Li+ is almost half of K+, while that of Cs+ is approximately 30% higher.
Which ion is the smallest?
More the nuclear charge on ion, electrons are more strongly attracted and thus size decreases. Hence, among the given ions Al3+ is the smallest ion.
What has the smallest atomic radius?
Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.
Why is the ionic radius of K+ smaller than Cl?
K+ has a bigger effective nuclear charge than Cl−, which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation.
Which has largest radius?
Atomic radii vary in a predictable way across the periodic table. 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.
Is F or F bigger?
More the atomic number size becomes larger. So F- is larger in size.
Which is larger Cl or Ar?
Actually, Cl has a greater atomic radius than Ar because of the greater attraction from the nucleus in Ar.
Which is more stable k or k +? BR or BR -? Why?
We see that, Pottasium(k) has 1 electron in it’s outermost shell, So k+ will have, 8 outermost electrons, According to Octet rule, K+ will be more stable !.
What is the highest energy level of K?
Potassium, K , is located in period 4, group 1 of the periodic table, which means that it has one electron on its highest energy level. The size of a potassium atom is determined by how far that solitary electron that resides on the highest energy level, i.e on the fourth energy level, is from the nucleus.