Answer:
There are seven elements that naturally occur as homonuclear diatomic molecules in their gaseous states: hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. In this manner, why do some elements exist as molecules? An element like helium, neon, argon etc. already have this octet of electrons, so they are stable as they are.
Explanation:
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The Classical Period of music may have given its name as the popular descriptor for all of Western sophisticated instrumental composition, but its actual timeline is relatively short. All of the other delineated musical eras get at least a full century. However, the Classical Era is often cited as the latter half of the eighteenth century. At its longest, the Classical Era ran just seventy to eighty years, ending no later than 1820. Despite the Classical Era's short run, its impact on instrumental music has been enormous.