a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, and aluminium, and alloys such as steel).
A metal doesn't have to be a certain state of matter, it just has to have those traits.
2. Playing with words sounds funny but with all seriousness room temperature is an internationally recognized term and ranges roughly between 15 C and 25 C. Details are below;
Although Brass was used for centuries beforehand, Zinc itself wasn't discovered until the eighteenth century.