True or false: Halogens are very stable because they have a full outer shell of 8

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Which material burns faster? metal aluminum

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