Which is a transition metal: gold, iron, copper, lithium? How can you tell?

Answer 1

Lithium is the only non-transition elements.

A metal that forms ions with a partially filled d-subshell is called a transition metal.

The other three are in the d-block and form ions with partially filled d-subshells; lithium is not in the d-block and cannot even be taken into consideration.

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Answer 2

Cameron Andrews

Due to its incomplete d-orbitals in its electron configuration, iron is classified as a transition metal.

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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.