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How is the atomic number of an atom determined?

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In electrically neutral atoms, this number is also equal to the number of electrons orbiting about the atom's nucleus. The atomic number of an element determines its position in the Periodic Table, and is usually denoted by the letter Z and written as a subscript before an element's symbol, as in 92U. read more

The atomic number of an element is determined by the number of protons in its nucleus. It's that simple. Note that the number of electrons will only equal the number of protons in an atom that is neutral, and can vary. read more

Mathematically, atomic number = no. of protons = no. of electrons or, Atomic number = number of p^+ or number of e^- For example, in one hydrogen atom, number of p^+ = 1 :. atomic number = 1 In one carbon atom, number of p^+ = 6 :. Atomic number = 6 Hence we can conclude that the Number of protons or electrons present in the atom, determines the Atomic number . read more

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