How Many Electrons in an Atom?

For an atom of an element:
number of electrons = number of protons = atomic number of element

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Isoelectronic Species

What do we mean by two or more species being isoelectronic?
What are some examples of isoelectronic species?
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Not a member?
A "free-to-view" tutorial is currently available for evaluation purposes at:
http://www.ausetute.com.au/isoelectronic.html