Magnesium ground state electronic configuration

An experiment is said to be, within a certain theoretical framework, perfect or complete if from different experimental observations complementary information can be obtained which finally allows the determination of all matrix elements involved and, therefore, all possible observables. This will be illustrated for 2p photoionization in atomic magnesium (ground state electron configuration ls22s22p63s2). 

Magnesium reacts with element X to form an ionic compound. If the ground-state electron configuration of Xis Is 2s 2p, what is the simplest formula for this compound ... 

Write the ground-state electron configurations for magnesium and sulfur. Are the gaseous atoms of these elements paramagnetic or diamagnetic ... 

Write out the ground state electronic configurations for (a) magnesium, (b) silicon, and (c) nickel. 

With these definitions, the ground state of the magnesium atom is then represented by the electron configuration for the orbitals Is, 2s, 2p, and 3s (see Fig. 1.1) and the symbols for the angular momenta and parity as... 

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