Q25 of 52 Page 38

On moving from left to right in a period in the periodic table, the size of the atom.

As we move from left to right in a period, the atomic number increases but the number of shell remains same. Thus electronic attraction increases thus reducing the size.

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23

Which one of the following depict the correct representation of atomic radius(r) of an atom?


 24

Which one of the following does not increase while moving down the group of the periodic table?

 26

Which of the following set of elements is written in order of their increasing metallic character?

 27

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.