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3. Metals and Non-metals
medium
$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.
$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.
$(iii)$ What are the ions present in these compounds ?
Option A
Option B
Option C
Option D
Solution
$(i)$ The representation of elements with valence electrons as dots around the elements is referred to as electron-dot structure for elements.
$(a)$ Sodium $(2,8,1)\,=\,\overset{\centerdot }{\mathop{Na}}\,$
$(b)$ Oxygen $ (2,6)\,=\,\overset{\centerdot \,\centerdot }{\mathop{:O:}}$
$(c)$ Magnesium $(2,8,2)\,=\,\overset{\centerdot \,\,\centerdot }{\mathop{Mg}}$
$(ii)$ as per image
$(iii)$ The ions present in $Na _{2} O$ are $Na ^{+}$ and $O ^{2-}$ ions and in $MgO$ are $Mg ^{2+}$ and $O ^{2-}$ ions.
Standard 10
Science
