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(b) Name another element to which it has SITUI (c) Is it smaller or bigger than another element with atomic no. 16? 3. Why has hydrogen been placed in the first group of the periodic table although it is a non-metal? How does the atomic radius change in a period and a group? 5. What change is observed across a period and down a group in the following: (a) Electron affinity (b) Ionization energy What is the unit of each? 6 Why are cations smaller than their corresponding atoms? 7. Why is the 18th gp of the periodic cable called the zero group? & The atomic numbers of the three elements X, Y and Z are 2,6 and 10 respectively. ( Which two element belong to the same group? Which two elements belong to the same period?Give reasons. 0 An element X belongs to 3rd period and group 2 of the periodic table. State her of valance electrons.