Question

Platinum is the costliest mental pick out noun and their kinds​

Answer 1

Explanation:

See this attachment..

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Answer 2

Answer:

Any of a number of chemical elements in the periodic table that form a metallic bond with other metal atoms; generally shiny, somewhat malleable and hard, often a conductor of heat and electricity. Any material with similar physical properties, such as an alloy.

Explanation:

Platinum is a precious metal.

• Platinum : proper noun

• metal : common noun