Mg
The species with the smallest atomic radius among K, Mg, Rb, and Ca is Rb (Rubidium). This is because atomic radius tends to decrease across a period from left to right in the Periodic Table, and Rb is located towards the right side of this group of elements.
Chlorine will have the smallest atomic radius, bromine the largest.
Beryllium has the smallest atomic radius among the alkali earth metals.
Atomic radius (in 10^-12 m): K : 231 Ca: 197 Sc: 160 Ti: 146 (smallest)
Atomic radius increases going down the periodic table and going from right to left, meaning that Fr (Francium) has the largest atomic radius and He (Helium) has the smallest. Therefore, Cl<S<P<Si<Al So the answer is Cl
The answer choices for this question wasn't provided. Oxygen has the smallest atomic radius. The higher the electronegativity in an element makes the atomic radius smaller.
Hydrogen has the smallest atomic radius - 25 pm.
Chlorine will have the smallest atomic radius, bromine the largest.
Argon doesnt have the smallest atomic radius, its chlorine.Argon has the largest atomic radius in period 3.
It is helium that has the smallest atomic radius. Use the link below to see a list of elements arranged by atomic radius.
Helium usually is listed with the smallest atomic radius when calculated. Hydrogen however has a smaller van der Waals radius The protium isotope of hydrogen has the smallest nucleus radius. It is 1.6 fm
Atomic radius (in 10^-12 m): K : 231 Ca: 197 Sc: 160 Ti: 146 (smallest)
Beryllium has the smallest atomic radius among the alkali earth metals.
Atomic Radius gets greater down the periodic table and gets smaller to the right in the periodic table. This means, in order of atomic radius, that the five smallest elements are Helium, Neon, Fluorine, Oxygen, and Hydrogen in that order. Check all of it out at http://www.ptable.com/ under properties>radius
Flourine and Phosphorous.
Fluorine has the smallest atomic radii because it is towards the right of the periodic table and on top.
The element in group 1 with the smallest atomic radius is lithium, due to its higher nuclear charge compared to the other elements in the group (such as sodium and potassium). This higher nuclear charge attracts the electrons more strongly, leading to a smaller atomic radius.
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 elements in the same period.