Answer: An existing theory is modified so that it can explain both the old and new observations.
Explanation:
Question 4: C-An element is a substance made up of two or more different types of atoms that
are not chemically combined.
Question 5: Coke, Aluminum foil, chicken noodle soup, Gatorade
It increases across a period and decreases down a group. A good way to remember this is that fluorine is the most electronegative atom, and it's to the top right of the table.
Explanation:
Because they have free electrons roaming around that can conduct electricity