Chemistry > 2006 > 5
WASSCE
Which of the following pairs of species contains the same number of electrons? [6C, 8O, 10Ne, 11Na, 12Mg, 13Al, 17Cl]
A.
Mg2+ and Al3+
B.
Cl- and Ne
C.
Na+ and Mg
D.
C and O2-
Answer: A
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