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Write the number of periods the Modern P...

Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.

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### Step-by-Step Solution 1. **Number of Periods in the Modern Periodic Table**: The Modern Periodic Table consists of **7 periods**. These periods are the horizontal rows in the table. 2. **Changes in Valency and Metallic Character from Left to Right in a Period**: - **Valency**: As we move from left to right across a period, the valency of elements generally increases from 1 to 4 and then decreases from 4 to 0. This is because the number of valence electrons increases, affecting how many electrons an atom can gain or lose to achieve stability. - **Metallic Character**: The metallic character decreases as we move from left to right in a period. This is due to the increasing nuclear charge (Z-effective), which holds the outer electrons more tightly, making it harder for the elements to lose electrons and exhibit metallic properties. ...
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Knowledge Check

  • When we move from left to right in a period electropositive charcter

    A
    Increases
    B
    Decrease
    C
    No change
    D
    First increase then decreases

  • In the periodic table, with the increase in atomic number, the metallic character of an element

    A
    Decreases in a period and increases in a group
    B
    Increases in a period and decreases in a group
    C
    Increases both in a period and the group
    D
    Decreases in a period and the group

  • In the periodic table, with the increase in atomic number, the metallic character of an element

    A
    decreases in a period and increases in a group
    B
    increases in a period and decreases in a group
    C
    increases both in a period and the group
    D
    decreases in a period and the group.

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    Valency of elements ______ in a period from left to right.

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