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

Name the element in group 17, period 2. (periodic table)

The identities of substances are the same before and after which type of change

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon