Chapter 4: Structure of the Atom

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Structure of Atom


Na+ has completely filled K and L shells. Explain.


Bohr and Bury suggested some rules for writing the number of electrons in different energy levels or shells. These rules are as follows:

1. The maximum number of electrons present in the shell is given by the formula ‘2n2’ , where, n stands for the energy level index or orbit number.

2. The outermost orbit can accommodate a maximum '8' electrons.

3. The orbits or the shells should be filled stepwise (first K shell will fill, then L shell, so on).

For example, the atomic number of sodium is 11. Its electronic configuration is (2, 8, 1). It contains one valence electron. Sodium cation forms when it loses one electron from its valence shell.

So, Na+ contains 10 electrons, and its "K" and "L" shells are completely filled.


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