Discussion
How many electrons are in Ba++ ?
Answer: B
Ba++ has 54 electrons.
Barium has atomic number 56, so a neutral atom has 56 electrons. The ion Ba2+ has lost its two outer 6s electrons:
\[ 56 - 2 = 54 \]
which gives it the stable electron configuration of the noble gas xenon.
56 is the count for the neutral atom. 46 would mean losing ten electrons, and 62 would require gaining six, the opposite of what a positive charge means.
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