What evidence always shows that a chemical change has happened? O A. The total mass of material changes.
O B. A new substance is produced.
C. A solid material dissolves in a liquid.
O D. A liquid changes into a solid.

B. A new substance is produced.

Explanation:

In chemical changes, you will always have a new end product from the reactants that were used within the process.

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.