Why do beryllium and fluorine belongs to same period?
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The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. ... Period 2 elements obey the octet rule in that they need eight electrons to complete their valence shell, where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell.
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no of shells in an atom of an element = period no
Beryllium has 2 shells and fluorine also has two shells in their atom . Therefore , they belong to the same period .
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