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An element X belongs to group 17 and 2nd...

An element X belongs to group 17 and 2nd period of the periodic table. Its atomic number will be

A

`9`

B

`14`

C

`7`

D

`15`

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To determine the atomic number of element X, which belongs to group 17 and the 2nd period of the periodic table, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Group and Period**: - The element X is stated to belong to group 17 and the 2nd period of the periodic table. 2. **Understand the Periodic Table Layout**: - The periodic table is organized into periods (horizontal rows) and groups (vertical columns). Group 17 is known as the halogens. 3. **Locate Group 17 in the 2nd Period**: - In the 2nd period, the elements are: - Lithium (Li) - Atomic number 3 - Beryllium (Be) - Atomic number 4 - Boron (B) - Atomic number 5 - Carbon (C) - Atomic number 6 - Nitrogen (N) - Atomic number 7 - Oxygen (O) - Atomic number 8 - Fluorine (F) - Atomic number 9 - Neon (Ne) - Atomic number 10 4. **Identify the Element**: - The only element in the 2nd period that belongs to group 17 is Fluorine (F). 5. **Determine the Atomic Number**: - The atomic number of Fluorine (F) is 9. ### Final Answer: The atomic number of element X is **9**. ---
To determine the atomic number of element X, which belongs to group 17 and the 2nd period of the periodic table, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Group and Period**: - The element X is stated to belong to group 17 and the 2nd period of the periodic table. 2. **Understand the Periodic Table Layout**: ...
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Knowledge Check

  • An element belongs to group 15 and third period of the periodic table. Its electronic configuration will be

    A
    `1s ^(2) 2s ^(2) 2p ^(3)`
    B
    `1s ^(2) 2s ^(2) 2p ^(4)`
    C
    `1s ^(2) 2s ^(2) 2p ^(6) 3s ^(2) 3p ^(3)`
    D
    `1s ^(2) 2s ^(2) 2p ^(6) 3s ^(2) 3p ^(2)`

  • A particular element belongs to group 13 and second period of the periodic table, it is

    A
    Gas, slightly metallic
    B
    Liquid, non- metallic
    C
    Solid, non-metallic
    D
    Solid, less metallic

  • An element X belongs to group 2 and period 3 of the periodic table. The chemical formulae of its nitrate, sulphate and phosphate respectively will be

    A
    `X(NO_(3))_(2), XSO_(4), X_(3)(PO_(4))_(2)`
    B
    `XNO_(3), XSO_(4), XPO_(4)`
    C
    `X_(3)(NO_(3))_(2), X_(2)(SO_(4))_(2), X_(2)(PO_(4))_(3)`
    D
    `X(NO_(3))_(3), X_(2)(SO_(4))_(3), X_(2)(PO_(4))_(3)`

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