The atomic number for sodium is 11 and the atomic number for oxygen is 8. Based on this information find out the chemical formula for Sodium oxide?

$N a_{2} O$

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$N a O_{2}$

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$N a_{2} O_{2}$

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$N a O$

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Solution

The correct option is A
$N a_{2} O$

We have been provided with the atomic number of sodium and oxygen. Using this information we can write the electronic configuration and find their valency of both the elements.

Name of the element Electronic configuration Valency

Sodium 2, 8, 1 1

Oxygen 2, 6 2

Since sodium has a valency one and oxygen has valency two we can use the cross over method. We interchange the valency of both the elements and write them in the subscript for each element. Hence the formula we get is $N a_{2} O$ .

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Name of the element	Electronic configuration	Valency
Sodium	2, 8, 1	1
Oxygen	2, 6	2