1.

Which pair of elements has similar properties?\(\Bigg[\begin{matrix}13 & 31 \\11 & 21\end{matrix}\Bigg]\)

Answer»
Atomic No.Electronic Configuration
\(\Bigg\{\begin{matrix}13 \\31\end{matrix}\)2,8,3
2,8,18,3
\(\Bigg\{\begin{matrix}11 \\21\end{matrix}\)2, 8,1
2,8,9,2

Since the elements having atomic number 13 and 31 have 3 outermost electrons. So, these elements are placed in 3rd group due to which these elements have similar properties.


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