The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3 and 4 respectively of the modem periodic table

The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3 and 4 respectively of the modem periodic table. Answer the following questions, giving justification in each case:
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(/if) Name the element having largest atomic radius.

(i) Group 2 because they have same number of valence electrons.
(ii)Be, because chemical reactivity increases for metals in a group from top to bottom.
(iii) Ca, as the atomic size increases from top to bottom in a groupas Ca has four shells.