Multiple Choice
A chlorine atom has 18 electrons and 17 protons. What is this atom called?
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2. Atoms & Elements
Ions
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How many total electrons are present in a Sr^{2+} ion?
A
36
B
40
C
38
D
34
Verified step by step guidance1
Identify the atomic number of strontium (Sr), which represents the number of protons and, in a neutral atom, also the number of electrons. For Sr, the atomic number is 38.
Understand that the Sr^{2+} ion has lost 2 electrons compared to the neutral atom because of the 2+ charge.
Calculate the total number of electrons in the Sr^{2+} ion by subtracting 2 from the atomic number: $38 - 2$.
Write the expression for the total electrons in Sr^{2+} as $\text{electrons} = Z - \text{charge}$, where $Z$ is the atomic number and charge is the positive charge on the ion.
Evaluate the expression to find the total electrons present in the Sr^{2+} ion.
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