With regards to lewis-electron diagrams, which of the following compounds has resonance forms?

Explanation:

The resonance compounds are compounds that have the same position of the atoms (same quantity and elements) but the position of the electrons arround them is different in each resonance compound.

In reality, the compound switches between all the resonance structures it has.

One example of resonance Lewis structures is the Ozone's as can be seen in the figure.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3