State whether the following statement is true or false :

On going down in a group of the periodic table, the number of valence electrons increases.

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Solution

False
On going down in a group of the periodic table, the number of valence electrons remains the same.

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What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table ?

Fill in the blanks in the following statements :

(a) The horizontal rows in a periodic table are called .............

(b) In going across a period (right to left) in the periodic table, the atomic size of the atom .............

(d) When we down in a group in the periodic table, the metallic character of elements ..............

(e) The tendency to gain an electron ................ on moving down in a group of the periodic table.

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