How does the valency of elements change on moving from left to right in the third period of the periodic table?

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Solution

The valency of the elements increases from 1(Na) to 4 (Si) and then decreases to 0 (Ar), on moving from left to right in the third period of the periodic table.

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How does number of (i) valence electrons (ii) valency ;vary on the moving from left to right :

(a) in the second period of a periodic table ?

(b) in the third period of a periodic table ?

Q. How do metallic character and valency of elements change in a period moving left to right in modern periodic table?

Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?

Q. What is periodicity in properties of elements with reference to the Modern Periodic Table ? Why do all the elements of the same group have similar properties ? How does the tendency of elements to gain electrons change as we move from left to right in a period ? State the reason of this change.

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How does the valency of elements change on moving from left to right in the third period of the periodic table?

The valency of the elements increases from 1(Na) to 4 (Si) and then decreases to 0 (Ar), on moving from left to right in the third period of the periodic table.

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