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No, neon is not the smallest radius in period 2. Helium has the smallest atomic radius in period 2 because it has the fewest number of electron shells. Neon has a larger atomic radius than helium because it has more electron shells.
Hydrogen is the smallest class of elements on the periodic table.
No, a geologic era is a longer unit of time than a geologic period. Geologic eras are divided into periods, which are further subdivided into epochs. The hierarchy from largest to smallest is era, period, epoch.
Carbon is the smallest atom that exhibits tetra-valency, meaning it can form four bonds with other atoms. This property is due to its atomic structure that includes four valence electrons available for bonding.
Australia is the smallest continent.