Copper, silver, and gold have all been know since ancient times because they appear in nature in elemental form (they usually exist as atom by itself) and were thus discovered thousands of years ago.
Fill in the blanks to complete the sentences below.
1. Copper, silver, and gold have all been know since ancient times because they appear in nature in ________ and were thus discovered thousands of years ago. But the majority of elements ________ and consequently, are hard to found in nature.
Readily oxidized so that they are covered with coloured film
Upper ground and water
Every most known compounds
are deep in ground
readily form compounds
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