The answer & explanation for this question is given in the attachment below.
24g 4Al+3O2=2Al2O3
27g x(g)
108 96
X=24g
Answer: The density of the object is 1.10 g/ml
Explanation: Density of object = ?
Mass of object = 26.5 g
Volume of object = volume of water displaced = 24.1 ml
Putting values in above equation, we get:

Thus density of the object is 1.10 g/ml
Diamond is not a rock it is a mineral.
Answer:
The answer is: both models because each shows an electron in the outermost shell.
Explanation: