An element X with the electronic configuration: 1s2, 2s2, 2p6, 3s2, 3p3. Derive the chemical formula of the compound formed.
1. The element is P but you don't give enough information to know anything about a compound; ie., a compound with what?
2.
M2O3 = 102
3*16 = 48
102-48 = 54 for 2*M; therefore,
54/2 = 27. Must be Al for M and M2O3 must be Al2O3.
To determine the chemical formula of the compound formed by element X, we need to analyze its electronic configuration and understand its valence electrons.
In the given electronic configuration: 1s2, 2s2, 2p6, 3s2, 3p3, we observe that:
- The first energy level (principal quantum number n = 1) is complete with 2 electrons in the 1s orbital.
- The second energy level (n = 2) is complete with 2 electrons in the 2s orbital and 6 electrons in the 2p orbital.
- The third energy level (n = 3) has 2 electrons in the 3s orbital and 3 electrons in the 3p orbital.
The valence electrons are the electrons in the outermost energy level (highest n value), which, in this case, is the third energy level (n = 3). Therefore, element X has 5 valence electrons.
Based on the number of valence electrons, we can determine the group or family in the periodic table to which element X belongs. The group number for this element will correspond to the number of valence electrons.
Since element X has 5 valence electrons, it belongs to Group 5A (Group 15) in the periodic table.
Now, to derive the chemical formula of the compound formed, we need to consider the transfer or sharing of electrons between the element X and other elements in the compound.
Since element X has 5 valence electrons, it can either gain 3 electrons to achieve a stable octet (8 valence electrons), or it can lose 5 electrons to achieve a stable duet (2 valence electrons). A more common tendency is for element X to gain 3 electrons.
Assuming element X gains 3 electrons, it will now have 8 valence electrons, making it resemble the nearest noble gas, which is neon (with the electronic configuration: 1s2, 2s2, 2p6). This means that element X is likely to form a compound with the chemical formula X3-.
Therefore, the chemical formula of the compound formed by element X is X3-.