Which of the following groups of elements do not have a charge and why?
Halogens, because they have seven valence electrons.
Noble Gases, because they have a full outer shell of electrons.
Alkali Metals, because they have one valence electron.
D
Alkaline Earth Metals, because they have two valence electrons.

Noble gases because they have a full outer shell of electrons.

Explanation:

Noble gases usually called inert gases are generally non reactive gases. They belong to group 18 elements.They tend to not gain the electron or not give up a electron as they have full valence shells. Because they already have full valence shell and therefore full outer energy level, they are very stable and hardly react with any other elements.

increases it

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.