Smallest atomic radius in Group 6A(16) - oxygen
Elements in a group are chemically similar to each other.
The periodic table is an arrangement of elements in groups and periods. The elements in the same group share a lot of chemical similarity with each other. The elements that are in the same period only have the same number of valence shells.
Atomic radius: The radius of an atom. This distance between an atom's nucleus and outer electron shell.
The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance
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