A solid, a liquid or a gas.
Zirconium cannot be broken down by a chemical change, because it is an element. The others are all molecules.
33.11 trillion kilometers is equivalent to 3.5 light years
hope this helps :)<span />
An ideal gas is defined as one in which all collisions between atoms or molecules are perfectly eleastic and in which there are no intermolecular attractive forces. One can visualize it as a collection of perfectly hard spheres which collide but which otherwise do not interact with each other.
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