An atom charged -3 has the atomic number 23 and an atomic mass of 32, the number of electrons of this atom are 20.
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What is an Atomic number?</h3>
An atomic number may be defined as the number of a chemical element in the periodic table, in which the elements are positioned in order of expanding the number of protons in the epicenter known as the nucleus.
In this question, the number of electrons is 20, because the number of electrons in an atom is always equal to the atomic number of that atom, which is 23 here.
But, an atom charged -3, so, 23-3 = 20. If an atom is charged negative, the number of electrons is determined by subtracting it with an atomic number, while if it is charged positive, the number of electrons is determined by adding it with an atomic number.
Therefore, it is well described above.
To learn more about Atomic numbers, refer to the link:
brainly.com/question/1805828
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i believe.