Chemistry Practice Problems Periodic Table Practice Problems Solution: Fill in the blanks to complete the sentences below...

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# Solution: 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 filmUpper ground and waterElemental formEvery most known compoundsare deep in groundreadily form compounds

###### Problem

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

Elemental form

Every most known compounds

are deep in ground

###### Solution

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.

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