1. The smallest particle of an element is called an
2-3. Compounds can be broken down to simpler substance through the process
called
4-5. The formula represents a
of a single element and this are called
molecules
6-8. In the universe,
makes up 75% of all matter,
makes
up about 20% and
being the 3rd (5%) most abundant element.
9-10. What makes the elements such as oxygen, hydrogen, zinc, potassium, and
calcium common?
11-12. What makes the compounds such as water, carbon dioxide, and sodium
chloride common?​