Na, Mg and A1 are the element of the same period of Modern Periodic Table having one, two and three valence
electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify
your answer stating reason for each case.
Dear student,
On moving left to right in a periodic table size decreases because of an increase in nuclear charge and on moving top to bottom in a periodic table size increases.
(i) Na, Mg, and Al are the elements of the same period so, the largest atomic radius is of a sodium atom.
(ii) The element which has a tendency to lose an electron will be a more reactive element and the tendency to lose electron decreases while moving left to right in a periodic table. Hence, Aluminium will be the least reactive element among these.
Regards
On moving left to right in a periodic table size decreases because of an increase in nuclear charge and on moving top to bottom in a periodic table size increases.
(i) Na, Mg, and Al are the elements of the same period so, the largest atomic radius is of a sodium atom.
(ii) The element which has a tendency to lose an electron will be a more reactive element and the tendency to lose electron decreases while moving left to right in a periodic table. Hence, Aluminium will be the least reactive element among these.
Regards