Four students each measured the mass of one 1.43 g sample four times. Which trial demonstrates the greatest accuracy? [A] Trial 1 [B] Trial 2 [C] Trial 3 [D] Trial 4 Mass Data of Sample Trial 1 Trial 2 Trial 3 Trial 4 Student A 1.43 g 1.52 g 1.47 g 1.42 g Student B 1.43 g 1.40 g 1.46 8 1.44 g Student C 1.54 g 1.568 1.58 g 1.50 g Student D 0.86 g 1.24 g 1.52 8 1.42 g
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Ответ:
Calcium because group 2 metals are all 2+ cations