Question

an element Z has a valency of 3 what is the formula of oxide of z?

Answer 1

Elements which have valency 3 is
B,Al, Ga,......
There oxide form is

Z2O3
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Answer 2

Hey there! ✌️

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Valency of z = 3

Valency of Oxygen= 2

Oxide Form= Z2O3

Because Of Criss Cross Method

Element Z has Valency 3 it's given

And we know that, Oxide = Oxygen = Valency 2

$<B><I>So when we write final product, The Valencies are exchanged, (CrissCross Method) </B></I>$

Hence, Final Answer is Z2O3

Some Elements with Valency 3 are Alluminium (Al), Gallium (Ga), Etc

$<B><I>If other Element Have valency as 2, Then, Suppose Z has Valency 2, Then It's Oxide will be Z2O2 ; 2 & 2 will be cancelled, And final formula will be ZO</B></I>$

But in the case of Z = 3,

3 and 2 can't be cancelled, Hence, We write it as Z2O3only.

$<B><I>Note, Here numbers used like Z*2*O*3* Are ALL in Subscript</B></I>$

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