Question

write any two diagonal relationship between beryllium and Aluminium

Answer 1

HEY MATE HERE IS YOUR ANSWER:-

Diagonal relationship of Be with Al Because of its small size Be differs from other earth alkaline earth metals but resembles in many of its properties with Al on account of diagonal relationship.          

(1) Be2+ and Al3+ have almost same and smaller size and thus favour for covalent bonding. 

(2) Both these form covalent compounds having low melting point and soluble in organic solvent.  

(3) Both have same value of electronegativity (which is 1.5).       

(4) The standard O.P of these elements are quite close to each other ; Be2+=1.69 volts and Al3+= 1.70 volts.       

5) Both become passive on treating with concentrated HNO3 in cold.  

(6) Both form many stable complexes for example (BeF3)-, (AlH4)-.   

(7) Like BeO, Al2O3 is amphoteric in nature. Also both are high melting point solids.          Al2O3 + 2NaOH → 2NaAlO2 + H2O          Al2O3 + 6HCl → 2AlCl3 + 3H2O      

 (8) Be and Al both react with NaOH to liberate H2 forming beryllates and alluminates.  Be + 2NaOH → Na2BeO2+H2   2Al + 6NaOH → 2Na3AlO3 + 3H2         

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Answer 2

1) Both Aluminium and Beryllium are metals and form a covalent bond with other atoms.

2) Oxides and hydroxides of both elements are amphoteric.

• Aluminium and Beryllium are both s group elements.
• Beryllium belongs to the second period and Aluminium belongs to the third period.
• They are placed diagonally in the periodic table.
• The main reason for the diagonal relationship is the identical size of the ions.
• Across the period, polarizing power increases and ionic size decreases.
• Down the group the ionic size increases and polarizing power decreases
• The two effects get compensated diagonally and both elements have the same size.
• This is the reason for the diagonal relationship.
• #SPJ1