Answer these questions based on the Periodic Table entry for sodium: 11
Na
22.991
What is the atomic mass?
What is the atomic number?
How many neutrons does sodium have?
What is the chemical symbol for sodium?
How many protons does sodium have?
How many electrons does it have in the n=2 orbit?

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.