Is mercury a proper noun

Answer 1

No, the noun Mercury is a common noun, a word for any mercury, the element symbol Hg and atomic number 80.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Freddy Mercury (Farrokh Bulsara), lead singer of the rock band Queen
• Mercury, the planet closest to the sun
• Mercury Avenue, Woodbridge Township, NJ or Mercury Street, San Francisco, CA
• Mercury International Trading Co., North Attleboro, MA
• "Mercury Rising", 1998 movie with Bruce Willis

Answer 2

Mercury is a proper noun because it is a name of a planet, if it was called planet, The word " planet " would be a common noun.

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