Group 1 Elements Flashcards
All group 2 elements are known as alkaline earth metals- true/false
False - beryllium is not considered to be and alkaline earth metal
Abundant alkali metals are
Sodium and potassium - lithium, rubidium and caesium have lower abundance
Longest lived isotope of Francium
Fr 223 [half-life = 21 minutes]
Elements ranked 5th and 6th in abundance in Earth’s crust
Calcium and Magnesium respectively [Strontium and Barium have relatively low abundance]
Percentage of igneous rocks which is the element radium
10^(-10)%
General electronic configuration of s-block elements
[Noble gas] ns1 and [Noble gas] ns2
Igneous rock is formed from
Cooled and hardened magma
Diagonal relationship is due to
Similarity in ionic sizes and charge/radius ratio of elements
The most electropositive elements are
Alkali metals
Ionization enthalpies of alkali metals are
Considerably low and decrease down the group
Hydration enthalpy order of group 1 element ions
Li+ > Na+ > K+ > Rb+ > Cs+
Lithium salts are never hydrated - true/false
False - most lithium salts are hydrated eg. LiCl.2H20
Ionization enthalpy order of group 1 elements
Li > Na > K > Rb > Cs> Fr
Metallic radius order of group 1 elements
Cs > Rb > K > Na > Li
Ionic radius of group 1 elements
Cs > Rb > K > Na > Li
Melting point order of group 1 elements
Li > Na > K > Rb > Cs
Boiling point order of group 1 elements
Li > Na > K > Rb > Cs
Density order of group 1 elements
Cs > Rb > Na > K > Li
Negative SRP value order for group 1 elements
Li > Rb > Cs > K > Na
Lithium flame colour
Crimson red [670 nm]
Sodium flame colour
Yellow [590 nm]
Potassium flame colour
Violet [766 nm]
Rubidium flame colour
Red violet [780 nm]
Caesium flame colour
Blue [455 nm]
Metals used in photoelectric cells
Caesium and Potassium
Lithium forms
Monoxides [O(2-)]
Sodium forms
Peroxides [O2(2-)]
K, Rb, Cs form
Super oxides [O2(-)]
Superoxide ion is only stable in the presence of
Large cations like K, Rb, Cs
4Li +O2 ———->
2 Li2O [oxide]
2Na + O2 ————>
Na2O2 [peroxide]