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Ionic bonding

To have a full outer shell, atoms sometimes need to lose or gain an electron. To do this, they must
bond with another atom.
Metal atoms become positively charged by losing an electron whereas non-metal atoms become
negatively charged by gaining an electron.

Dot & cross diagrams


Page 2

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Sometimes an atom needs to lose or gain 2 electrons. But if another electron only needs to lose or
gain one, 2 atoms with 1 electron spare or needed could bond with an atom that needs to lose or
gain 2. This has happened with calcium and chlorine to create…


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