Answer:
They have two valence electrons and enter into reactions where they can donate their two valence electrons
Explanation:
Here, we want to predict the number of valence electrons
The elements belong to the group 2 of the periodic table
Elements in the periodic table are placed in groups based on the number of valence electrons they have
It is expected that elements in group 2 of the periodic table have 2 valence electrons
Their reactivity is that, they react with other atoms by donating this two valence electrons. They then achieve the electronic configuration of the noble gas in the last period
