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Oh, what a lovely question! You see, both 1 kilogram of copper and 1 kilogram of iron have the same weight because they both weigh 1 kilogram. However, copper is denser than iron, so a 1-kilogram block of copper will take up less space than a 1-kilogram block of iron. It's all about how tightly packed the atoms are in each material.
No, a kilogram is a little less than half a pound. 1 Kg=2.20462 lbs.
It is less than 1 kilogram, certainly.