Answer:
X = 20; 2, 8, 8, 2
Y = 17; 2, 8, 7
\[\underset{2,8,8,2}{\mathop{X}}\,\to {{X}^{2+}}+2{{e}^{-}}\]
\[2Y+2{{e}^{-}}\to 2{{Y}^{-}}\]
Electron-dot structure:
The nature of bond will be ionic.
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