Question

Calcium is an element in group II of the periodic table and sits on the same period as potassium.

How would you expect the reactivity of calcium with water to compare with the reactivity of group I element with water?

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Answer 1

Calcium will be more reactive .

Lets look at EC of Calcium

$\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^2$

• Two valence electrons

It will react with water like below

$\\ \sf\longmapsto Ca+H_2O=Ca(OH)_2$

Now

Looking at EC of potassium

$\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^1$

• one valence electron

It will react with water like below

$\\ \sf\longmapsto K+H_2O=KOH$