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.

Hope this helped!

i know insulin is primary but i dont know the others im sorry

explanation:

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be