What element has the most similar properties to sodium?

Answer 1

Lithium

Chemical "properties" are based on their electron structure, and it is how the Periodic Table of the Elements is constructed. The columns (Groups) are elements with the same valence (outer) shell electron structure, increasing in mass as you go down a group.

So, the elements with similar properties to sodium (Na) are all of those elements in the same Group. The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K). Of those, I would consider Lithium to be "closest" as it shares the higher reactivity with sodium compared to the heavier elements in the Group.

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Answer 2

Cooper Anderson

Potassium.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.