There are 1000 grams in a kg.
To convert g to kg, dovide by 1000.
3.5/1000= 0.0035 kg
Final answer: D
Answer:
alkali metals is your answer
The unknown material : gold
<h3>Further explanation </h3>
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:

ρ = density
m = mass
v = volume
mass of unknown material : 15.06 g
volume : 0.78 ml
The density of unknown material :

Materials that match the density: gold