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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.
Rb
Li+ , Na+ , K+ , Rb+ , Cs+ , Fr+
Hydrogen (H) Lithium (Li) Sodium (Na) Potassium (K) Rubidium (Rb) Cesium (Cs) Francium (Fr)
It is a metallic element in the alkali family
A+ Na
Rb is the largest, Li the smallest in the row above. Group 1 of the periodic table: Fr > Cs > Rb > K > Na > Li > H
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
Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
Rb
Li+ , Na+ , K+ , Rb+ , Cs+ , Fr+
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.
Lithium has the least number of protons, rubidium has the most number of protons.
Hydrogen (H) Lithium (Li) Sodium (Na) Potassium (K) Rubidium (Rb) Cesium (Cs) Francium (Fr)
All the alkali metals (Li, Na, K, Rb, Cs, Fr) are very reactive.