Determine the compound formed when two elements with the electronic configurations 2,8,1 and 2,6 react together?

K₂O

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Na₂O

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N a O_{2}

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NaO

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Solution

The correct option is B Na₂O
Sodium (atomic number 11) has an electronic configuration of 2,8,1 whereas, 2,6 is the electronic configuration of oxygen which has an atomic number of 8.

When sodium and oxygen react together, they produce sodium oxide.
The formula of a compound formed by the combination of two elements can be obtained by cross multiplication of their valencies.
Element: Na O
Valency: 1 2
Thus, the chemical formula of sodium oxide is $N a_{2} O$

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