The period number of an element in the periodic table indicates the number of occupied energy levels in its electron configuration. In other words, the period number corresponds to the number of electron shells that surround the nucleus of the atom.
The highest filled energy level, also known as the valence shell, is the outermost shell that contains electrons. It is the highest energy level that is completely filled with electrons.
The relationship between the period number and the number of the highest filled energy level is that the period number is equal to the number of the highest energy level for elements in the s and p blocks of the periodic table. For example, the elements in period 2 have two occupied energy levels, and the highest filled energy level is the second energy level (valence shell). For elements in the d and f blocks, however, the highest filled energy level may not necessarily be the same as the period number.
What is the relationship between the period number and the number of the highest filled energy level
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1 answer