Question

of energy?
1
2.4. Question numbers 4(a)-4(d) are based on the variation in the atomic radii of first group
elements given below. Study and answer the questions that follow.
Group 1 Elements: Na Li Rb Cs K
Atomic radii (pm): 186 152 244 262 231
4(a) Arrange them in proper order as in the Periodic table of group 1. Name the elements
which have the smallest and the largest atoms.
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4(b) Why is the size of the atom increases on going down in a group?
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4(c) Which element of group 1 is most reactive and why?
4(d) Which element of group 1 is most metallic and why?
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Answer 1

Answer:

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