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Identify the elements X and Y using the ...

Identify the elements X and Y using the ionisation energy values given below :
Ionization energy (kJ/mol)
`{:(,1^(st),2^(nd)),(X,495,4563),(Y,731,350):}`

A

X=Na , Y=Mg

B

X=Mg , Y=Na

C

X=Mg, Y=F

D

X=F, Y=Mg

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