Class 10 > Science

Question

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?
Hard

Solution

The modern periodic table has 7 periods in periodic table.The valency first increases from left to right till the middle then decreases in a period. The metallic character decreases along a period from left to right. Atomic size goes on increasing down the group, whereas valency remains the same in a group.

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