What does "8 is great" mean as it pertains to valence electrons?

stability and completely filled orbitals

Explanation:

As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

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tony (lordcaos066)

d.) circle motion requires a force to give it a centripetal acceleration.