The photo shows wires made of pure copper, an element, What would the smallest piece of copper be?

Element before carbon on the periodic table

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.

Which best describes eras and periods?