These six elements are Li, Na, K, Rb, Cs and Fr.
Element Rb (Rubidium) has the lowest ionization energy among Rb, Na, C, and F. This is because as you move down a group on the periodic table, the ionization energy typically decreases due to the increase in atomic size. Rubidium is located below sodium (Na) in the same group, so it has a lower ionization energy.
The alkali metal cations are lithium (Li+), sodium (Na+), potassium (K+), rubidium (Rb+), cesium (Cs+), and francium (Fr+). These cations are formed when alkali metals lose their outermost electron to achieve a stable electron configuration.
There is not only one element classified as alkali metal; this term refers to all periodic table column 1 elements excluding hydrogen. These are Lithium, Li; Sodium, Na; Potassium, K; Rubidium, Rb; Cesium/Caesium, Cs; Francium, Fr.
Fluorine is the most electronegative element. It can form compounds with almost every element. Some examples are NaF, KF and ClF.
Rb (Rubidium) is the largest element among Li, Na, Rb, and K as you move down the same group or in the same period from left to right on the periodic table.
Rb (rubidium) is the largest element among K (potassium), Rb (rubidium), Na (sodium), and Li (lithium). This is because as you move down a group in the periodic table, the atomic size increases due to the addition of more electron shells.
Rb > K > Na > Li. The order based on atomic size is Rb > K > Na > Li. Therefore, the size of the circles should reflect this order from largest to smallest.
Rb
Smallest to largest is going down the group 1. I.e. Li is smallest<Rb<Cs
Elements in Group 1 include, Li, Na, K, Rb, Cs, Fr
The element with the smallest first ionization energy is Francium, as it is located in Group 1 of the periodic table and has the largest atomic size. Among the elements listed, lithium (Li) would have the smallest first ionization energy as it is closer to the upper right of the periodic table compared to sodium (Na), potassium (K), and rubidium (Rb).
I think you lost some formatting there. Na+ is isoelectronic with neon, if that's what you were trying to ask.
H Li Na K Rb Cs Fr
The alkali metals are: Li, Na, K, Rb, Cs, Fr.
group 1 is Li, Na, K, Rb, Cs and Fr.
Li Na K Rb Cs Fr (hope this is help)