Calcium ground state electronic configuration

Calcium reacts with element X to form an ionic compound. If the ground-state electron configuration of X is ls22s22p4, what is the simplest formula for this compound ... 

Give the ground-state electron configuration for each of the following elements (a) Sodium (b) Aluminum (c) Silicon (d) Calcium... 

Table 8.3 shows the partial orbital diagrams and ground-state electron configurations for the 18 elements in Period 4 (again with filled inner levels in brackets and the sublevel to which the last electron has been added in colored type). The first two elements of the period, potassium and calcium, are the next alkali and alkaline earth metals, respectively, and their electrons fill the 45 sublevel. The third element, scandium (Z = 21), is the first of the transition elements, those in which d orbitals are being filled. The last electron in scandium occupies any one of the five 3d orbitals because they are equal in energy. Scandium has the electron configuration [Ar] 4s 3d. ... 

Figure 15. Schematic diagrams of the one-dimensional interaction potentials between Ca and HX in the vicinity of the Pi and D2 states of calcium. The crossings with the ground-state and electron transfer potentials are indicated by the numbers 1, 2 and 3. Also represented is the most favorable electronic configuration of the calcium for this transition. Adapted from Ref. [252].

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