Question

Na,mg and al are the elements of the same period of modren periodic table having one,two and three balance electrons respectively. which of these elements 1. Has largest atomic radius 2. Is least reactive Justify your answer stating hebrrason in each case

Answer 1

1. Na
Because as we go across th period due to increase in nuclear charge the nucleus pulls the electrons towards itself. intern reducing the size of the atom

2. Al
Because as we go across the period atomic number increases, so elements trend to gain electrons so they become less reactive