It stands for Rubidium
Rb is the symbol for the element, rubidium.
Rb has lower electronegativity than Na. Electronegativity decreases as you move down a group in the periodic table, so Rb, which is located below Na in the periodic table, has lower electronegativity.
Rubidium (Rb) is located in the 5th period of the periodic table.
In group 1, the far left column of the Periodic Table, which is Lithium (Li), Sodium (Na), Potassium (K), Rudibium (Rb).
group 1, period 5. symbol Rb
There is no R in the periodic table. There is Rb, Rf, Re, and Rn.
group 1 is Li, Na, K, Rb, Cs and Fr.
Li+,Na+,K+,Rb+,Cs+,Fr+
Xe has a larger atomic radius than Rb because atomic radius generally increases from top to bottom within a group in the periodic table. Xe is located below Rb in the periodic table, so it has more electron shells, resulting in a larger atomic radius.
There are 18 groups and 7 periods in the modern periodic table.
These elements are Cs, Rb, K, La, Ac, Po, Tl.
Sodium, Na, is in group 1 on the periodic table. The elements in group1 are the elements in that vertical column, which are Li,Na,K,Rb,Cs,Fr.