Because they contain electrons in the 7th energy level, which is farthest from the nucleus.
The largest atoms are typically found in the bottom left corner of the periodic table, in the category of alkali and alkaline earth metals. These atoms have more electron shells and therefore larger atomic radii compared to atoms in other areas of the periodic table.
Atomic number of an element can be found on the periodic table. It is located at the upper left-hand corner of the table.
The noble gases are located in group 18, which starts at the upper right hand corner of the periodic table with helium.
The periodic table is arranged into Groups (i.e. columns) and Periods (rows). Now, each element is assigned an atomic number which is equal to the number of protons within its nucleus. Each element is then arranged in order of increasing atomic number from left to right. There is a more indepth answer relating to how the periodic table is arranged, however this is how they are "listed".
The most electronegative elements are found in the top right corner of the periodic table, in the halogen group (Group 17). These elements include fluorine, chlorine, bromine, iodine, and astatine.
The elements with the smallest atomic radii are found in the top of the P block of the periodic table. Helium (He) has the smallest atomic radius. Francium, on the other side of the periodic table (very bottom of the S block), has the largest atomic radius.
K (potassium) would have the largest atomic radius out of the elements given because it is located in the lower left corner of the periodic table. As you move down a group in the periodic table, the atomic radius increases due to the addition of more electron shells.
The atomic number is the number located in the upper left corner of the element on the periodic table. Elements are listed in order of increasing atomic number.
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.
Atoms with the largest atomic radius will be found in the lower left corner of the periodic table, specifically in the alkali metals and the alkaline earth metals groups. This is because these elements have the fewest protons in their nucleus relative to their electron cloud, resulting in a larger atomic size.
Elements in the top right corner of the periodic table tend to have the largest first ionization energies. This includes elements such as helium, neon, and fluorine. They have a strong attraction for their valence electrons due to their small atomic size and high effective nuclear charge.
Cesium is largest element on the periodic table.The atomic radius of Cs is around 273pm. It is present at the lower left corner of the table.
At the lower right corner of the Periodic Table.
The metals in the lower left corner of the periodic table are the least electronegative.
The largest atoms are typically found in the bottom left corner of the periodic table, in the category of alkali and alkaline earth metals. These atoms have more electron shells and therefore larger atomic radii compared to atoms in other areas of the periodic table.
The number in the upper right corner of each element on the Periodic Table is its atomic number. This number represents the number of protons in the nucleus of an atom of that element.
Atoms to the left on the periodic table Atoms with a large atomic radius