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The number of valence electrons increase...

The number of valence electrons increases down a group of the periodic table.

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On moving down a group of the periodic table,

(a) How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way? (b) How does the tendency to gin electrons change as we go down in group 17 of the periodic table? Why does it change this way?

How does the valency of elements vary is going down a group of the periodic table?

In general, the properties that decrease and increase down a group in the periodic table, respectively, are :

(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table? (b)What happens to the number of valence electrons in the atoms is elements as we go down in a group of the periodic table?

(a) How does the electropositive character of elements change on going down in a group of the periodic table? (b) State how the valency of elements varies (i) in a group and (ii) in a period, of the periodic table.

(a) What is the number of valence electrons in the atoms of first element in a period? (b) What is the usual number of valence electrons in the atoms of the last element in a period?

Assertion: Electron gain enthalpy always becomes less negative as we go down a group in Modern periodic table. Reason: The size of the atom increase on going down the group in Modern periodic table and the added electron would be farther from the nucleus.