Answer:
Chromium
Explanation:
Cr has 24 atomic number and mass number 52
Mass box C is 10+5. (So C is 15)
But if C was 30, how many times could you put B (5) into it?
30/5 = 6
You would need 6 boxes of B to make 30 grams of C.
1) 1.8 micrograms(least)
2) 1.8 grams
3) 1.8 kilograms(greatest)