Radius of hydride (H⁻) ion - Chemistry Stack Exchange
Dec 30, 2019 · the ionic radius of an $\ce{H-}$ ion is 134±2 pm, which is slightly larger than the radius of $\ce{F^-(II)}$ (128.5 pm) and almost the same as the radius of $\ce{O^2-(II)}$ (135 pm). This evaluation agrees with the generally accepted trend that the radius of an $\ce{H-}$ ion is nearly the same or slightly larger than that of an $\ce{F-}$ ion.
"Crystal radius" vs "Ionic radius" - Chemistry Stack Exchange
May 31, 2015 · What is the difference between crystal radius and ionic radius? For $\ce{NaCl}$ for example the ions combine to a crystal, and I would have guessed they are equal. But I then found an example of data, where they are not. I am aware that ionic radius is the radius of an atom's ion. Quite simple. So what is crystal radius?
Na+ or Ca2+ . Which ion has the larger radius?
Oct 16, 2017 · where C.N. - coordination number; C.R. - crystal radius; I.R. - ionic radius. The data is also available online for free . Comparing similar coordination environments, it's easier to notice that overall $\ce{Na+}$ is indeed larger than $\ce{Ca^2+}$:
ions - Why ionic radius increases with negative charge?
Feb 18, 2023 · An ion with a negative charge has gained electrons. Hence the negative charge. With a greater negative charge, there should be more attraction towards the positive charge. As a result the electrons should be pulled towards the positively charged electrons. Ionic radius should decrease. Further an ion gains an electron to achieve a full shell.
What is the hydrated diameter of a lithium ion？
Feb 5, 2024 · As pointed out in a comment by @poutnik, ion mobility can complement the insight. Hayamizu et al. for instance monitored the diffusion of $\ce{Li(H2O)^+_x}$ by solution NMR spectroscopy, and determine an effective Stokes radius of $\ce{Li+}$ in diluted aqueous solutions of about $\pu{300 pm}$ ($ = \pu{3 Å}$).
inorganic chemistry - Why is the ionic radius of hydride so large ...
Jan 5, 2021 · The effective ionic radius of hydride ion varies from 1.27 to 1.52 Å (10), being much more highly sensitive to the particular cation present and to the particular assumptions used in deriving the radius than the fluoride value.
Ionic radii of cations and anions - Chemistry Stack Exchange
Dec 13, 2023 · Ionic radii decreases as the charge decreases, while in a group, they increase. For example, the 2nd period of elements Li, Be, B, C, N, O, F, and Ne shows trends in ionic radii. The first three elements lose electrons and gain He configuration, while $\ce{C}$ gains electrons and becomes a negative ion, larger than the positive ions. The last ...
Why is the ionic radius of Al (3+) smaller than that of Li+?
Sep 8, 2016 · I was examining the ionic radii of some ions from this site for a school assignment. I noticed a weird anomaly in the ionic radius of $\\ce{Li+}$ as compared to that of $\\ce{Al}^{3+}$. The ionic ...
Which has a greater atomic radius, Cl- , K+ , S-2 , Ca+2 , Ar?
Aug 19, 2018 · Think of it this way: 1) Count the electrons (all of them) in each atom or ion. 2) What happens to the orbitals, and thus to atoms or ions with a given number of electrons (let us say, 18 electrons), when you increase the atomic number of …
Why is the strontium ion smaller than the potassium ion?
Apr 23, 2020 · Similarly, there is a big drop from $\ce {Rb^{+}}$ to $\ce {Sr^{2+}}$, from 166 to 132 pm. It may well be the case that the addition of another proton cause a significant reduction of the ionic radius, such that it outweighs the increase in radius due to presence of an additional electron shell. $\endgroup$ –