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Which of the following species contain only $1$ electron?

The charge on an atom containing $17$ protons,$18$ neutrons,and $18$ electrons is = .......

If $W$ is the mass number and $N$ is the atomic number of an element,then:

Which of the following does not contain a number of neutrons equal to that of $_{18}^{40}Ar$?

Compared with an atom of atomic weight $12$ and atomic number $6$,the atom of atomic weight $13$ and atomic number $6$:

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