Question

Write The Valency Of Aluminium

Answer 1

Answer:

Valency of aluminium is: Atomic number of aluminium is 13 so its electronic configuration is 2, 8, 3. Since it has 3 electrons in its valence shell, it will lose 3 electrons to complete its octet hence its valency is +3.

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Answer 2

Answer:

Valency :- The combining capacity of an element is called Valency.

• If the electrons in outermost shell are less than 4 (4 also) then , Valency of the element is equal to number of electrons in outermost shell.

• If the electrons in the outermost shell are greater then 4 , then Valency of the element is 8 - n (n = Number of electrons in outermost shell)

• If an element has ns^2 np^6 ( 8 electrons in outermost shell) configuration the valency is "0".

Electronic configuration of Aluminium (Al) is,

$1s ^{2} \: 2s ^{2} \: 2p ^{6} \: 3s^{2} \: 3p ^{1}$

As there are 3 (n < 4) electrons in the Valence shell (outermost orbit) the valency of Aluminium (Al) is 3.