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Animated Ion formation
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Description
A A sodium atom (Na) becomes a positively charged sodium ion (Na+) when it loses the electron in its third shell. The atom’s full second shell is now its outermost, so it has no vacancies.

B A chlorine atom (Cl) becomes a negatively charged chloride ion (Cl–) when it gains an electron and fills the vacancy in its third, outermost shell.


electron loss Sodium atom 11p+ 11e— chage:0 Sodium ion 11p+ 10e— chage:+1 electron gain 0 Chlorine .— atom ./ 17p+ : I. < 17e— \ charge: 0 Chloride ion / 18e- \ charge: —1
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