When an atom that has no charge loses three electrons, it becomes a positive ion.

negative ion.

positive isotope.

negative isotope.

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

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.