What is an example of two elements with similar properties and an explanation of how you know?

Answer 1

Sodium (Na) & Potassium (K)

Both are alkali metals that are highly reactive.

Both are soft metals and have a similar 'shiny' appearance.

The reason for the above similarities is due to the fact that both elements are in Group 1 of the periodic table and are separated only by one period ('row'). Group 1 means that they have 1 valence electron and thus (very) readily form a positive ion to fulfil the octet rule and have a full, outer shell, of electrons.

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Answer 2

Peyton Adams

Two examples of similar elements are lithium (Li) and sodium (Na), which are both in Group 1 of the periodic table, have a single valence electron, and are similar in their tendency to lose this electron, which results in similar chemical reactivity.

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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.