Chapter 4: Structure of the Atom

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Q
Structure of Atom

Question:

Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Answer:

According to this model, the electrons revolve around the nucleus in discrete orbits called energy shells or energy levels. Each energy level is associated with a definite amount of energy. The change in energy takes place when the atom jumps from one energy level to another level. The energy level present in an atomic structure is shown below:

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).

 


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