S-block elements mnemonics and properties / Alkali and alkaline earth metal properties

ALKALI METALS

Mnemonics :-
@लिना को रुप छ फरक
@LiNa Ko Rub Csa Frak.
Li = Lithium
Na = Sodium
K = Potassium
Rb = Rubidium
Cs = Caesium
Fr = Francium

Properties :-
1. Atomic radii : Li < Na < K < Rb < Cs < Fr
2. Ionic radii : Li⁺ < Na⁺ < K⁺ < Rb⁺ < Cs⁺
3. Electronegetivity : Li > Na > K > Rb > Cs
4. First ionization potential : Li > Na > K > Rb > Cs
5. Melting point : Li > Na > K > Rb > Cs
6. Density : Li > Na > K > Rb > Cs
7. Colour of the flame :
    ➝Li = Red
    ➝Na = Golden
    ➝K = Voilet
    ➝Rb = Red
    ➝Cs = Blue
8. Rb and Cs Shows Photoelectric effect.
9. Stability of hydrides : LiH > NaH > KH > RbH > CsH
10. Basic nature of hydroxides : LiOH < NaOH < KOH < RbOH < CsOH

ALKALINE EARTH METALS

Mnemonics :- 
@Beta Mange Car Scooter, Baap Rhoye.
Be = Beryllium
Mg = Magnesium
Ca = Calcium
Sr = Strontium
Ba = Barium
Rh = Rhodium

Properties :-
1. Atomic radii : Be < Mg < Ca < Sr < Ba
2. Ionic radii : Be⁺ < Mg⁺ < Ca⁺ < Sr⁺ < Ba⁺
3. Electronegetivity : Be > Mg > Ca > Sr > Ba
4. First ionization potential : Be > Mg > Ca > Sr > Ba
5. Melting point : Be > Mg > Ca > Sr > Ba
6. Density : Be > Mg > Ca > Sr > Ba
7. Colour of the flame : 
    ➝Be = Colourless (White)
    ➝Mg = Colourless (White)
    ➝Ca = Brick red
    ➝Sr = Blood red
    ➝Ba = Apple Green
8. Stability of hydrides : BeH₂ > MgH₂ > CaH₂ > SrH₂ > BaH₂
9. Basic nature of hydroxides : Be(OH)₂ < Mg(OH)₂ < Ca(OH)₂ < Sr(OH)₂ < Ba(OH)₂


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