The electron configuration or organisation of electrons orbiting neutral atoms shows a recurring pattern or periodicity. The electrons occupy a series of electron shells (numbered 1, 2, and so on). Each shell consists of one or more subshells (named s, p, d, f and g). The electron configuration describes where the electrons are inside orbitals. The structure of the Periodic table of elements is partly based on electron configuration. There are four kinds of electron configurations: s, p, d, and f orbitals.

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    contains the same number of electrons (10; with configuration 1s 2 2s 2 2p 6) and are thus termed a collection of isoelectronic ions ; varies in the nuclear charge; The radius of each ion decreases with an increase in nuclear charge: Oxygen and fluorine precede neon and are nonmetals, sodium, magnesium and aluminum come after neon and are metals.

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    An up-to-date periodic table with detailed but easy to understand information THE ELECTRONIC CONFIGURATIONS OF THE FIRST 36 ELEMENTS LITHIUM 1s orbitals can hold a maximum of two electrons so the third electron in a lithium atom must go into the next available orbital of higher energy. This will be further from the nucleus in the second principal energy level. The second principal level has two types of orbital (s and p).

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