Question

question 88 (1 point)
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o²⁻ ion has _____number of electrons and _____number of neutrons

1. 10 electrons, 8 neutrons
2. 8 electrons, 16 neutrons
3. 10 electrons, 10 neutrons
4. 8 electrons, 8 neutrons

Explanation:

Step1: Determine electron number of \( O^{2-} \)

Oxygen (O) has an atomic number of 8, so a neutral O atom has 8 electrons. The \( O^{2-} \) ion has gained 2 electrons, so electrons \( = 8 + 2 = 10 \).

Step2: Determine neutron number of \( O^{2-} \)

Oxygen has a mass number of 16 (most common isotope). Neutrons \( = \text{mass number} - \text{atomic number} = 16 - 8 = 8 \).

Step3: Match with options

From Step1 and Step2, \( O^{2-} \) has 10 electrons and 8 neutrons, which matches option 1.

Answer:

1. 10 electrons, 8 neutrons