The correct answer is 4.
This is because, as you move farther across a periodic group (left to right), because gaining electrons becomes easier, thus increasing electronegativity and decreasing metallic properties.
I believe its Sodium Chloride.
I hope that helps!
Relative dating is the process of determining whether an object or event is older or younger than other objects or events. Absolute dating is d<span>etermining the age of an event or object in years. From absolute dating, the real age of the object is obtained which is not present for relative dating. Hope this helps.</span>