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How do you calculate the valency of an e...

How do you calculate the valency of an element from its electronic configuration?

Text Solution

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The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. The number of electrons lost or gained (or shared) by one atom of an element to achieve the nearest inert gas electron configuration, gives us the valency of the element.
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(a) How is the valency of an element determined if its electronic configuration is known? Determine the valency of an element of atomic no. 9 (b) Given below are some elements of the Modern Periodic Table. Atomic numbers of the elements are given in the parentheses: A(4), B(9), C(14), D(19), E(20) (i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell? (ii) Which rwo elements belong to the same group? Give reasons for your answer. (iii) Which one of the above elements belonging to the fourth period has bigger atomic radius and why?.

The atomic number of an element is 25. Write its electronic configuration.

Knowledge Check

  • Find the odd element from the given electronic configuration.

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

  • The valence shell electronic configuration of Cr^(2+) ion is

    A
    `3 p^(2) 4 s^(2)`
    B
    `4 s^(2) 3 d^(2)`
    C
    `4 s^(2) 3 d^(0)`
    D
    `4 s^(0) 3 d^(0)`

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    Find the atomic number and valency of an element whose atom has the electronic configure 2,8,4.

    What do you understand by the term electronic configuration of an element ? Write down the electronic configuration of oxygen (At No. = 8).

    How are the group number and period number of an element in the periodic table determined from the electronic configuration of the element ?

    An atom of an element has one electron in the valence shell and the two consecutive inner shells have 8 electrons each. Find the atomic number of that element. Write the electronic configuration of preceding and succeeding elements.

    Electronic Configuration Of Elements

    How do we know whether a given element is a non-metal if we know its electronic configuration ?

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