Which pair has larger size and why?

a. K or K+ b. F or F-

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.  

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

i think its 100

i hope this !