Multiple Choice
What is the charge on a chloride ion?
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2. Atoms & Elements
Ions
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Which of the following is the correct ionic symbol for an ion with 34 protons and 36 electrons?
A
Br^{2+}
B
Br^{2-}
C
Se^{2-}
D
Se^{2+}
Verified step by step guidance1
Identify the element by its number of protons. The atomic number corresponds to the number of protons, so an element with 34 protons is selenium (Se).
Determine the charge of the ion by comparing the number of protons and electrons. Since the ion has 34 protons and 36 electrons, it has gained 2 extra electrons.
Calculate the charge: Charge = Number of protons - Number of electrons = 34 - 36 = -2, indicating a 2- charge.
Write the ionic symbol by combining the element symbol with the charge. For selenium with a 2- charge, the correct ionic symbol is $Se^{2-}$.
Verify that the other options do not match the proton number or charge: Br has 35 protons, so it cannot be correct for 34 protons.
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