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How many electrons are present in $^9_4Be^{2+}$ ?...

How many electrons are present in $^9_4Be^{2+}$ ?

A.

2

B.

4

C.

5

D.

6

View answer & explanation

Correct answer is A

Neutral Be has 4 electrons but $Be^{2+}$ means it has lost two electrons from possible four and became a positive ion.

$\therefore$ the number of electrons left will be equal to two.

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