Question

A uni-negative ion contain 18 electrons. What will be its atomic number?

Answer 1

An atom gains one electron to form a uni negative ion. Therefore, the neutral atom will contain one electron less. Thus, its atomic number is 17.

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Answer 2

Explanation:

As the said element is uninegative it means it bears -1 charge and it has 18 electrons so one electron must be due to the negative charge.

So it's original atomic number must be 17.