Which of two elements among the following will display the most similar chemical properties?

Aluminum and calcium

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Nickel and phosphorus

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Chlorine and sulfur

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Carbon and sulfur

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Lithium and potassium

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Solution

The correct option is E Lithium and potassium
Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level.
$L i$ lithium and $K$ potassium both belong to first group (alkali metals) and thus have similar chemical properties.

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