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The certain concentrations of Cu vs A certain concentrations of Cu

Both phrases are not correct. The correct phrasing should be 'certain concentrations of Cu.' The word 'certain' is used to emphasize a specific amount or type of something, and 'Cu' should be capitalized as it is the chemical symbol for copper.

Last updated: March 30, 2024

The certain concentrations of Cu

This phrase is not correct. 'The' should not be used before 'certain' in this context, and 'cu' should be capitalized as it is the chemical symbol for copper.

The correct phrase should be 'certain concentrations of Cu.'

Alternatives:

  • certain concentrations of Cu

A certain concentrations of Cu

This phrase is not correct. 'A' should not be used before 'certain' in this context, and 'cu' should be capitalized as it is the chemical symbol for copper.

The correct phrase should be 'certain concentrations of Cu.'

Alternatives:

  • certain concentrations of Cu

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