Question

Which of the following groups of elements have chemical properties that are most similar :

• A. $Na,K,Ca$
• B. $Mg,Sr,Ba$
• C. $Be,Al,Ca$
• D. $Be,Ra,Cs$

Answer 1

Answer: (B), (C)

$Mg,Sr,Ba$
$Be,Al,Ca$

In option B, Mg, Sr, Ba belongs to 2nd group so they are have same outer electronic configuration of $n{s}^2$.
In option C, Be and Ca belongs to 2nd group so they are having same properties how ever, Al shows similar properties with Be and Ca due to diagonal relationship of $Be$ with$Al$.
In options A and D, both 1st and 2nd group elements are present together so their properties are different.
Hence, options B and C are correct.