The atomic radius of a chemical element is the distance from the center of the nucleus to the outermost shell of an electron. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius.

2024年9月1日 · Atomic radius of all the elements are mentioned in the chart below. (Note: Below mentioned radii are the van der Waals radius in picometer (pm)). Details about this Periodic table: Access detailed info on all elements: atomic mass, electron configurations, charges, and more. View rotating Bohr models for all 118 elements.

2016年10月29日 · What element has the smallest atomic radius? Atomic size decreases across a Period, but INCREASES down a Group. And thus the element with the smallest atomic radius should be helium, Z=2. This site reports that the atomic radius is 31× 10−12m, where the atomic radius of the hydrogen atom is 53 ×10−12m.

2023年12月21日 · The element with the smallest atomic radius among the given options is Helium (B). This is due to helium being located at the top right of the periodic table, where atomic radii are the smallest. Helium has fewer energy levels and tightly held electrons, resulting in its small size.

2024年11月3日 · Scandium (Sc) has the smallest atomic radius among the elements listed: calcium, potassium, scandium, and titanium. This is due to its position in the periodic table, where atomic radius decreases from left to right. Therefore, Scandium is smaller than both calcium and titanium as well as potassium. Explanation: Determining the Smallest Atomic ...

2016年10月23日 · From electron filling of atomic shells we know that the smallest atomic radius will be of the element which has electrons having lowest principal quantum, n = 1. As such we have only two elements which fill the 1s orbital. 1. Hydrogen 1s1. 2. Helium 1s2. We know that Hydrogen atom has one proton in its nucleus whereas helium atom has two protons.

2024年11月6日 · The element with the smallest atomic radius among calcium, potassium, scandium, and titanium is titanium (Ti). This is determined based on the periodic trends where atomic radius decreases from left to right across a period.

2017年6月24日 · Atomic radius of helium is 31pm ( 31 × 10^-12 m) . Helium has smallest atomic radius in the modern peroidic table due to complete filled subshell , highest ionisation potential and high effective mucleur charge .

2024年5月30日 · The period 4 element with the smallest atomic radius is chlorine, which has a greater number of protons in the nucleus pulling the electrons closer, making it smaller compared to other...

Atomic size decreases across a Period but INCREASES down a Group. Explanation: And thus the element with the smallest atomic radius should be helium, Z=2. This site reports that the atomic radius is $$31 \times 10^{-12}m$$, where the atomic radius of the hydrogen atom is $$53 \times 10^{-12}\,m.$$