Chemistry help

Qureshi

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So i have this science exam tomorrow. I just need to know an elements combining capacity is the same as its ionic charge if it were an ion right? So for example, oxygen has 8 electrons and protons so therefore it has a combining capacity of -2. And the ionic charge of oxide (oxygen anion) is -2 as well. So is it always the same?
 

KingForever7

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No.

An Oxygen Atom has 8 protons and 6 electrons on it's outer shell and 2 electrons on it's inner shell...thus has 0 charge

2 more electrons is added to the outer shell to complete the shell.

Thus an Oxygen Ion(or anion) has 8 protons and 8 electrons on its outer shell and 2 electrons on it's inner shell....thus has a -2 charge
 

Qureshi

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No.

An Oxygen Atom has 8 protons and 6 electrons on it's outer shell and 2 electrons on it's inner shell...thus has 0 charge

2 more electrons is added to the outer shell to complete the shell.

Thus an Oxygen Ion(or anion) has 8 protons and 8 electrons on its outer shell and 2 electrons on it's inner shell....thus has a -2 charge
but the combining capacity is -2 right
 
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