atomic size of element increasing with increasing in number of shell in the third period of periodic table name the smallest elemen

Argon (Ar) is smallest element in 3rd period in periodic table.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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