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Here we will discuss the given question.
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The question is predictive formula of the ionic compound formed from combining aines of the following pairs of elements.
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Write the charge on each iron, then put them together so they equal zero.
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So here first one here is, first atoms are given here is sodium.
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That is sodium and oxygen.
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Sodium and oxygen so any represent sodium and all represent oxygen so charge this is k -tine and this is anine so it is plus one charge it belongs to group one of the period variable and it has a minus two it belongs to group six of the periodable so it gains two electrons for its stability and it lose one electron for its stability so here we will exchange these valency so we will exchange this valency and we will get the formula here.
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So this is the formula sodium n -a -2 or sodium oxide.
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And second one is given elements are lithium and bromine formula for lithium is l -i.
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This belongs to group 1, so it is plus 1 charge.
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And next is bromine belongs to group 7, so it is minus 1 valency.
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And formula formed is here.
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We will exchange...