Arrange the following elements from greatest to least tendency to accept an electron. Rank from greatest to least tendency to accept an electron. To rank items as equivalent, overlap them. Br Se Ge Ca K I arranged this in the order i listed above and was told it was the incorrect answer and Your answer shows the general trend, but there are some exceptions. For example, the tendency to gain an electron is lower than expected if a stable electron configuration is lost.

Br > Se > Ge > K> Ca

Explanation:

Generally in the periodic table, we know that electron affinity increases across a period. Electron affinity refers to the energy released when an extra electron is added to a neutral gaseous atom. Most times, the addition of an electron leads to the formation of a uninegative ion.

The sequence of decrease in electro affinity values appears to be consistent until we get to calcium and potassium. One would have ordinarily expected potassium to have a lower electron affinity than calcium. However, if potassium accepts an electron, that electron goes on to fill the 4s level. This process is more exothermic than in the case of calcium where the extra electron is added to the 3d level. The energy difference between the 4s and 3d levels is enough to make the process less exothermic (only 2.37KJmol-1) compared to that of potassium (48.4 KJmol-1). This explains the order of arrangement seen in the answer above.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.