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The universe is made up of an infinite number of different chemical substances, which are formed by the union of atoms. Hydrogen and helium atoms are the most abundant in the universe. The identity of these elements is defined by the number of protons they have. That is, atoms that have only one proton are hydrogen atoms, those that have two protons are helium atoms, three protons are lithium atoms, four are beryllium, five are boron, six are carbon, and so on. In fact, this is how they are organized in the periodic table, in increasing order of number of protons. We call this number the atomic number and represent it by the letter Z. Therefore, atoms with the same atomic number are atoms of the same chemical element. But how is it possible for atoms of the same chemical element to be different? There are basically 5 justifications and that is what we will see in this video. Financial support - Pix key [email protected] SOCIAL NETWORK / prsjoao.reis References FELTRE, Ricardo. Fundamentals of Chemistry: single vol. 4th ed. São Paulo: Moderna, 2005. https://www.wtamu.edu/~cbaird/sq/2014...