In which period does the filling of 2p orbitals begin?

Question

In which period does the filling of 2p orbitals begin?, The second period (n = 2), The third period (n = 3), The fourth period (n = 4), The fifth period (n = 5)

MARKS App · Accepted Answer

The second period (n = 2) starts with lithium and the third electron enters the 2s orbital. The next element, beryllium has four electrons and has the electronic configuration 1s22s2. Starting from the next element boron, the 2p orbitals are filled with electrons when the L shell is completed at neon (2s22p6).

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