Consider the elements Na, Mg and Al and their respective atomic numbers 11, 12 and 13. Write the electronic configuration of each element and answer the following question:
Which element is least reactive?

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Solution

Electronic configuration
Atomic numbers of Sodium ( $Na$ ), Magnesium ( $Mg$ ) and Aluminium ( $Al$ ) are 11, 12 and 13 respectively.
Electronic configuration of Sodium = (2, 8, 1)
Electronic configuration of Magnesium = (2, 8, 2)
Electronic configuration of Aluminium = (2, 8, 3)
All these elements belong to period 3.
Reactivity
Among the metals, the reactivity decreases from left to right of the period whereas in non-metals, the reactivity rises.
So, Aluminium is least reactive than other elements.

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Consider the elements Na, Mg and Al and their respective atomic numbers 11, 12 and 13. Write the electronic configuration of each element and answer the following question:Which element is least reactive?

Consider the elements Na, Mg and Al and their respective atomic numbers 11, 12 and 13. Write the electronic configuration of each element and answer the following question:
Which element is least reactive?