The graph at the right shows the atomic radius for the 19 elements in the periodic table. (a) Describe the trend in atomic radius in going from H (atomic number 1) to K (atomic number 19). (b) Find the three elements represented with blue dots on a periodic table. What do their placements in the table have in common? (c) Find the three elements represented with red dots on a periodic table. What do their placements in the table have in common? (d) Based on the graph, what is the radius of C? Radius (pm) 250 200 150 100 50 Atomic radius of elements 1-19 0 Li He Na Ne 10 Atomic number Ar K 20