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Fluorine atom contains 7 electrons in th...

Fluorine atom contains 7 electrons in the outermost shell. But its valency is '1'. Explain.

Text Solution

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1) Valency is the number of electrons present in the outer most orbit of an atom.
2) The distribution of electrons in fluorine (atomic number 9) is 2, 7.
3) Hence the valency of fluorine could be 7.
4) But it is easier to fluorine to gain one electron for becoming octet.
5) Hence its valency is determined by subtracting seven electrons from 8 and which gives you a valency '1' for fluorine.
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Knowledge Check

  • Fluorine atom contains seven electronsin outermost shell, but its valency is '1'. Predict the reason.

    A
    It can loss six electrons from the valency shell.
    B
    It can loss only one electron from the valency shell.
    C
    It can gain only one electron.
    D
    It can gain only seven electrons.

  • An atom with 8 electrons in its outer most shell is chemically …………

    A
    stable
    B
    unstable
    C
    both
    D
    none of these

  • An atom of an element 'A' has three electrons in its outermost shell and that of 'B' has six electrons in the outrer most shell. The formula of the compound formed between these two elements is

    A
    `A_3 B_4`
    B
    `A_2 B_3`
    C
    `A_3 B_2`
    D
    `A_2B`

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