how can the type of chemical bond be predicted based on the electronegativity coefficient? please help guys

Rule of Thumb

Explanation:

Predicting Bond Types

As a "rule of thumb", electronegativity differences can be used to predict if a bond will be covalent, polar covalent or ionic. If the difference in χ between two bonding atoms is less than 1/2, they are of very similar electronegativity and it is a covalent bond.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates