Question

rhenium ion with 68 electrons
express your answer as a signed integer. for example, 2+ or 1-.

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part b

potassium ion with 18 electrons
express your answer as a signed integer. for example, 2+ or 1-.

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Explanation:

Step1: Find rhenium's atomic number

Rhenium (Re) has an atomic number of 75, so a neutral Re atom has 75 electrons.

Step2: Calculate Re ion charge

Charge = Protons - Electrons = $75 - 68 = +7$

Step3: Find potassium's atomic number

Potassium (K) has an atomic number of 19, so a neutral K atom has 19 electrons.

Step4: Calculate K ion charge

Charge = Protons - Electrons = $19 - 18 = +1$

Answer:

7+
1+