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We have that the the density of FeS is mathematically given as
From the question we are told
Iron(II) sulfide has a primitive <em>cubic</em> unit cell with <em>sulfide</em> ions at the <em>lattice points.</em>
The ionic radii of iron(II) ions and sulfide ions are 88 pm and 184 pm, respectively.
What is the density of FeS (in g/cm3)?
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Density</h3>
Generally the equation for the Velocity is mathematically given as

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The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.
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<u>ANSWER</u> </h3>
4. O²-
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<u>EXPLANATION</u> </h3>
O²- has 16 electrons while Ne has 18 electrons. O²- is a molecule that has one electron added to each atom, meaning that there are two extra electrons which makes O²- the same electron configuration as of Ne atom.
Answer:
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Explanation: