In 1913 Niels Bohr proposed a new model of the atom that included quantized electron orbits: electrons still orbit the nucleus much as planets orbit around the sun, but they are only permitted to inhabit certain orbits, not to orbit at any distance.
About reports the melting point of gold is 1,064.43 degrees Celsius. The melting point of a solid is the temperature at which it becomes a liquid. Gold's boiling point is 2,807 degrees Celsius.
Most stone will melt at around 1500 degrees Celsius (2750 Fahrenheit). As for architecture, it is used, but it is so much heavier than most metals, it can't be used for things like skyscrapers ( at great heights, anyway).