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From the given elements, Mg has the largest atomic radius, hence the size.
The farther to the left and toward the bottom of the periodic table, the lower the electronegativity, and the larger the atomic radius. Calcium has a large atomic radius in comparison to elements in it's own period. What are you comparing calcium too? Calcium does have a large radius but not the largest, the largest is Cesium.
The atoms become smaller in atomic radius.
Of the noble gases, helium has the smallest atomic radius. There are different ways to define atomic radius, and the different ways give different results so I will not attempt to present values for the radii of the inert gas atoms. Instead, I will point out a practical consequence of the small atomic radius of helium. Because of the small size of its atoms, helium diffuses out of common silicate minerals much more easily than do the other inert gases. J. M. Wampler, June 17, 2009
For the representative elements (main group elements), atomic radius generally decreases from left to right across a period. Example: B and Fl: Fl has the smaller atomic radius Li and Be: Be has the smaller atomic radius
The atoms with the largest atomic radii are found in the lower right side of the periodic table. Smallest atoms are found in the higher left part of the periodic table. He has the smallest atomic radii.
Atomic radius increases down the group. So larger atomic radius are present at the bottom.
From the given elements, potassium has the largest atomic radius.
If the atoms are the same, it is the atomic radius.
From the given elements, Mg has the largest atomic radius, hence the size.
The negative ionic radius is larger than the neutral atomic radius
Two atoms of same element (for a given isotope) are identical and hence have the same atomic radius.
The farther to the left and toward the bottom of the periodic table, the lower the electronegativity, and the larger the atomic radius. Calcium has a large atomic radius in comparison to elements in it's own period. What are you comparing calcium too? Calcium does have a large radius but not the largest, the largest is Cesium.
Atomic radius decreases across a row (increasing positive charge in the nucleus causes electrons in the same energy level to "shrink" into the nucleus due to electrostatic attraction). This means that potassium has the largest atomic radius in period 4.
The order is: O (60 pm), Se (115 pm), K (220 pm), Cs (260 pm); these are covalent radii after Slater.
Atomic radii have not been measured or calculated based on theoretical principles for all of the elements. However, based on the information available in the wikipedia tables of atomic radii it would appear that the largest atom will prove to be that of francium.
Atomic Radius means the size of the atoms, the distance from the atomic nucleus to the outermost electron orbital.