CM is the chemical symbol for curium, named after the famous scientist Madam curie. Why wasn, t the symbol C, Cu or Cr used instead.

Explanation:

Because these symbols already existed for other elements. Curium was discovered much later than these elements, and comes after them in the periodic table, therefore the first choice of these element symbols went to Carbon, Copper and Chromium.

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space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

i think its 5049.

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