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Answer:
Protons
Explanation:
It's the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
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-Ionic bonds lose or gain electrons usually between a non-metal and a metal,
-Covalent bonds share electrons usually between two non-metals
When your substance either; change color, start to smell, explode, form bubbles, precipitate, and/or get hotter or colder.