Question

how many group 2nd period...​

Answer 1

Answer:

table?

The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells.

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Answer 2

Explanation:

it is lithium and berilium