Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw electron-dot of structure of the product and also state the nature of the bond formed between both the elements.

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Solution

The atomic number of $X = 20$
The electronic configuration of $X = 2, 8, 8, 2$
Since the valence shell of $X$ contains two electrons in the valence shell. Therefore, it loses two-electron to attain noble gas configuration and forms a dispositive ion.
The atomic number of $Y = 17$
The electronic configuration of $Y = 2, 8, 7$
Since the valence shell of $Y$ contains seven electrons in the valence shell. Therefore, it gains one electron to attain noble gas configuration and form an anion.
Hence, one atom of $X$ combines with two atoms of $Y$ to form a compound $X Y_{2}$ .

Since the bond is formed by the complete transfer of electrons. So, the bond is ionic in nature.
Electron - dot structure :

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