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1.

112: Copernicium: 285

2.

58: Cerium: 140.12

3.

55: Caesium: 132.91

4.

48: Cadmium: 112.41

5.

98: Californium: 251

6.

96: Curium: 247

7.

6: Carbon: 12.011

8.

17: Chlorine: 35.543

9.

29: Copper: 63.546

10.

27: Cobalt: 58.933

11.

24: Chromium: 51.996

12.

20: Calcium: 40.078