Noble gases are the least<span> reactive </span>elements<span> in the periodic table because they have a full valence shell. Examples are, Argon, Neon, Xenon, and Helium</span>
Use the equation for density :
Density = mass / volume
Density = 120 / 480
Density = 0.25
4- Ag+ions thats the answer i hope its correct
