The three elements have following electronic X=2,4 y= 2. Z= 2,8
Find the noble elements among them
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X=2,8=10: It is the electronic configuration of neon.
Y=2,8,7=17: It is the configuration of the halogen family of chlorine atom which is non-metal
Z=2,8,2=12: It is the configuration of alkaline earth metals of magnesium atom which is metal.
Therefore, X is a noble gas, Y is a non-metal, and Z is a metal.
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