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My textbook says the following:

For an electrically neutral or complete atom, the atomic number also equals the number of electrons. This atomic number ranges in integral units from 1 for hydrogen to 92 for uranium, the highest of the naturally occurring elements.

I'm wondering what is meant by "integral units" in this context?

I would greatly appreciate it if people could please clarify this.

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    $\begingroup$ It means the said number can be 1, or 10, or 25, but never 1.5. $\endgroup$ – Ivan Neretin May 2 at 20:45
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    $\begingroup$ No, it should be just integers. "Integral number" looks like literal translation from another language. $\endgroup$ – Mithoron May 2 at 21:03
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    $\begingroup$ If the author has used "integral units of charge" it would have been much better. Definition 1b(1) at Merriam-Webster. $\endgroup$ – MaxW May 2 at 22:57
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    $\begingroup$ @ThePointer Integral can be used to mean "of or relating to integers". An example of this usage in mathematics is the concept of an integral domain $\endgroup$ – Tyberius May 3 at 0:21
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    $\begingroup$ @ThePointer "discrete" is not the same thing as "integers"; 1, 1.1, 1.2, 1.3 ... is discrete. I also second what Tyberius has said. $\endgroup$ – orthocresol May 3 at 14:33
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This is only a way of saying that the atomic number will never be a decimal number like 1.5 or 16.8

One consequence is that if you carry out an experiment which gives you a decimal number as an atomic number, then you must have a mixture or something is wrong.

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