Question

write down the formula by using onion and cation of Aluminium oxide

Answer 1

Answer:

The formula for aluminum oxide is Al2O3.

Explanation:

The correct answer is Al2O3.

Let us see how we got the answer; Look at the electronic arrangement of Al and O atoms.

Al ( Z= 13) has 13 electrons with following electronic configuration. 1s22s22p63s23p1

It loses three electron in its 3s and 3p subshell to achieve stability and forms ion Al3+.

Al3+ = 1s22s22p6

O ( Z=8) on the other hand has eight electrons and wants to gain two electrons to achieve stable noble gas configuration.Oxygen atom on gaining two electrons forms negative oxide ion, O2− ion.

O ( Z=7) = 1s22s22p4

O2− = 1s22s22p6

Three Oxygen atoms gains two electrons each ( total of six) from two Al atoms, each Al atom loses three electrons (total of six) to three oxygen atom , in this process each Al atom becomes Al3+ ion and Oxygen atom after gaining two electrons becomes O2− ion.

Answer 2

Hey mate!

Here is your answer > >

Aluminium has a valency of 3

Oxide has a valency of 2

Formula>>

Al O

3 2

By Cross multiplication we get

Al2O3


Hope it helps!

Thankyou ☆ ☆