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Why Ga has small size than Al exceptionally ?

When we move down to Ga from Al we see that 3d shell fills before Ga and due to increase in effective nuclear change size of Ga in smaller than aluminium.
 

Related Questions:

Why Ga has small size than Al exceptionally

Why aqueous solution of borax reacts with two moles of acids ?

What is structure of solid Ortho Boric acid ?

What is the structure of trimetaboric acid and trimetaborate ion?  

Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?

Why Borazine (B3N3H6) is also known as inorganic benzene ?.

Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.

Why B-F do not exist as dimer?. Explain.

Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?

Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?

Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:

What is the molecular formula of Borax ?

What is the difference between the structure of AlCl3 and diborane?

Titration of Borax: Tincal : Suhaga :

Structure of Borax: Tincal or Suhaga:

Titration of Boric Acid:

DIBORANE-HYDRIDE OF BORONE-(B2H6):

CHEMICAL PROPERTIES OF DIBORANE:

STRUCTURE OF BORON NITRIDE:

STRUCTURE OF BORAZINE OR BORAZOLE:

STRUCTURE OF DIBORANE :

BORIC ACID (H3BO3) :

BORAX BEAD TEST:

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