Differences between reversible and irreversible changes​

Difference between reversible changes and irreversible changes. A substance can return to its original state. ... Most physical changes are reversible changes. All chemical changes are irreversible changes.

Explanation:

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Difference between reversible changes and irreversible changes. A substance can return to its original state. ... Most physical changes are reversible changes. All chemical changes are irreversible changes.

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explanation:

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.