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So in this video we're going to talk about question 104 from chapter 2, which says a certain element only has two naturally occurring isotopes, one with 18 neutrons and one with 20 neutrons.
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The element forms minus one charged ions when inionic compounds.
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Predict the identity of the element.
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What number of electrons does the minus one charged ion have? so we can use the fact that our element likes to form minus one charged ions to help identify it.
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So which elements, if we look at the periodic table, like to form, minus one charged ions.
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While our halogens are just one column to the left of our noble gases here in group 17, these elements like to react to gain an electron because gaining electron gives them the electronic configuration of a noble gas, which is very stable.
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So these are the elements that tend to react to form that minus one charged an ion.
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So we know that the element we're looking for is in group 17.
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We know that this element is a halogen...