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X- 6. electronic conf. 2,4
Y-9. = 2,7
Z-12. = 2,8,2
W-18. =2,8,8
1) anion is formed by Y as it will complete its octet by gaining 1 electron
2) Z will form a cation by losing electrons
3) W because it has complete shells and is an inert gas.
4)Z, neon has 10 electrons and by losing 2 electrons Z will have 10 electrons.
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