Question

question 27 (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

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Explanation:

Step1: Determine proton number of oxygen

Oxygen has atomic number 8, so 8 protons.

Step2: Calculate electron number of O²⁻

An oxygen atom has 8 electrons. O²⁻ has gained 2 electrons, so 8 + 2=10 electrons.

Step3: Determine neutron number of oxygen

The most common isotope of oxygen has mass - number 16. Neutron number = mass - number - proton number = 16 - 8 = 8 neutrons.

Answer:

1. 10 electrons, 8 neutrons