Why is neon in the same group of the periodic table as helium?

- "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)."

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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