The atomic number of three elements A, B and C are given below : {:("Element",A,B,C),("Atomic number",5,7,10):} Answer the following: (a) Write the group number of the three elements in the Modern Periodic Table. (b) Mention the period of these elements in the Modern Periodic Table. (c) Out of these three elements which one has the smallest atomic radius and why ?

The atomic number of three elements A, B and C are given below : {:("

1.	The atomic number of three elements A, B and C are given below : {:("Element",A,B,C),("Atomic number",5,7,10):} Answer the following: (a) Write the group number of the three elements in the Modern Periodic Table. (b) Mention the period of these elements in the Modern Periodic Table. (c) Out of these three elements which one has the smallest atomic radius and why ?
Answer» SOLUTION :(a) `{:("Element:",A,B,C),("Atomic number:",13,15,18):}` (b) All the three ELEMENTS BELONGS to the second period. (c) 'C' is SMALLEST, as the atomic size decreases from left to right in a period.