Question

the metals of group 2 from top to bottom are be, mg, ca, sr and ba, ​

Answer 1

Barium is the element that will form ions most easily because, it has a large size and the effective nuclear charge that holds the valence electrons is very weak

Due to this, we can easily pluck out an electron and hence ionise it easily

The common feature of their electronic configuration is that the valence shell has always 2e- and the common valence shell configuration is given by ns²

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