The atomic numbers of the elements `Na, Mg, K` and `Ca` are 11,12,19 and 20 respectively. The element having the largest atomic radius is:

Which element has the largest atomic radius?

Which element has largest atomic radius?

11, 12, 13 and 14 are the atomic numbers of the elements Na, Mg, Al and Si respectively. Which element have more atomic radius ?

The atomic numbers of three elements A, B and C are 11, 13 and 19 respectively. Explain which two of the elements will belong to the same group of the periodic table.

Na, Mg and Al are the elements 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.