question 27 (1 point)\nlisten\no²⁻ ion has __________ number of electrons and ________ number of…

question 27 (1 point)\nlisten\no²⁻ ion has __________ number of electrons and ________ number of neutrons\n1) 10 electrons, 8 neutrons\n2) 8 electrons, 16 neutrons\n3) 10 electrons, 10 neutrons\n4) 8 electrons, 8 neutrons\nprevious page next page\npage 27 of 30

question 27 (1 point)\nlisten\no²⁻ ion has __________ number of electrons and ________ number of neutrons\n1) 10 electrons, 8 neutrons\n2) 8 electrons, 16 neutrons\n3) 10 electrons, 10 neutrons\n4) 8 electrons, 8 neutrons\nprevious page next page\npage 27 of 30

Answer

Answer:

  1. 10 electrons, 8 neutrons

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.