Final answer:
Without additional context on what the expected actual densities are for the materials in question, there is no way to determine which of the provided density values is incorrect.
Step-by-step explanation:
To answer which density value is NOT correct, we must look at the density calculations provided in the experiment data and compare them with typical density values. From the information given, we have a calculated density value for nickel (Ni) as 2.23 g/cm³, which implies that Ni does not form a simple cubic structure since its actual density is different. When examining options 1) 1 g/cc, 2) 0.8 g/cc, 3) 0.93 g/cc, and 4) 0.9 g/cc, the incorrect value would be the one that is farthest from the expected actual density of the material in question. Without additional context or the actual densities to which these values are compared, it is impossible to determine which value is incorrect. Density calculation requires precision, and the number of significant figures used in the measurements directly affects the validity of the calculated density.