According to the periodic table, which of the following series of elements is ordered according to decreasing reactivity? f Mg, Si, Cs, He g Cs, Mg, Si, He h He, Cs, Si, Mg j Si, He, Cs, Mg

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.  

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

well in order to answer this question you have to provide more information < 3

1.solid

2.carbon dioxide

3.helium