Multiple Choice
How many protons are present in an ion that has 18 electrons and a -1 charge?
1
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2. Atoms & Elements
Ions
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How many total electrons are present in a Ba^{2+} ion?
A
58
B
56
C
54
D
52
Verified step by step guidance1
Identify the atomic number of barium (Ba), which represents the number of protons and, in a neutral atom, also the number of electrons. For Ba, the atomic number is 56.
Understand that a Ba^{2+} ion means the barium atom has lost 2 electrons, resulting in a positive charge of +2.
Calculate the number of electrons in the Ba^{2+} ion by subtracting 2 from the number of electrons in the neutral atom: $56 - 2$.
Express the calculation as an equation: $\text{Number of electrons in Ba^{2+}} = Z - 2$, where $Z$ is the atomic number of Ba.
Conclude that the total number of electrons in Ba^{2+} is the result of the subtraction, which gives the final count of electrons in the ion.
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