the atoms in a gas move more freely while those in a solid can barely move and the atoms in a solid are more slow...there for a gas has more energy than a solid
it is its electrons, if an atom of an element is not stable which means its outershell is not full of electron is going to react more than an atom which has full shells... e.g.. take the noble gases...
the outermost electrons of an atom. these are called valence electrons. atoms are also grouped in the periodic table based on their valence electrons. to complete a full outermost shell there must be...