Different Metals are discovered in different time stages in the history.

Explain with examples, how the years of discovery of metals are related to their reactivity, ease of extraction and the abundance in the Earth's crust.

How Reactivity relate to the years of discovery of metals ?

The later the metal was discovered, the higher the reactivity it has
Take iron and aluminium as an example
Iron was discovered thousands of years ago due to its stable properties, while aluminium was discovered in recent centuries because it is chemically reactive
Its reactive properties give rise to the difficulty in extraction and production

I hope you'll find my answer useful

係咪 9 分？

應該要寫埋 reactive metals（eg K, Na）果 d 要用 electrolysis 先可以 extract 到