Multiple Choice
When are anions formed?
2. Atoms & Elements
Ions
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One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation?
A
65Zn
B
65Ga3+
C
65Zn2+
D
65Ni2+
Verified step by step guidance1
Identify the number of protons in the isotope. The mass number is the sum of protons and neutrons. Given the mass number is 65 and there are 35 neutrons, use the equation: . Solve for protons: .
Calculate the number of protons: . The element with 30 protons is zinc (Zn).
Determine the charge of the cation. The neutral atom of zinc has 30 electrons. The cation has 28 electrons, indicating it has lost 2 electrons. Therefore, the charge is +2.
Combine the information to write the symbol of the cation. The isotope is zinc with a mass number of 65 and a charge of +2, so the symbol is .
Verify the symbol matches the given options. The correct answer is with a mass number of 65.
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