Question

Na mg or al are the element of the third Period of the modern periodic table having group number 1,2 and 13 respectively which one of these element has the 1.highest valency 2. largest atomic radius and 3. maximum chemical reactivity justify your answer stating the reason for each

Answer 1

1) aluminum has high valency ( 2,8,3)

Because we no that in group valency are increase .

2) In period , atomic size is decrease

So, sodium have high atomic size

3) sodium (Na) because chemical reactivity decrease in period