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NEETChemistryClassification of Elements and Periodicity in Properties

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

Options

  1. AThe second period (n = 2)
  2. BThe third period (n = 3)
  3. CThe fourth period (n = 4)
  4. DThe fifth period (n = 5)

Correct answer

A. The second period (n = 2)

Step-by-step solution

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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