Because more than one substance was released (following a color change signifying a chemical reaction), the sample was indeed, a compound.
Answer:
18 electrons
Explanation:
If you search on Google you get the same answer, so the question gives you your answer.
Answer:
2 valence electrons
Explanation:
it's a group 2 element. has 2 valence electrons in the outer energy level.
Ionic compounds have a strong force of attraction between the oppositely charged ions, so a lot of energy is needed in order to break the strong bonding force between those ions.