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What are valence electrons?...

What are valence electrons?

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The electrons in the ultimate (or outermost) and in some cases, penultimate shell of an atom that are responsible for chemical bonding are known as valence electrons.
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Knowledge Check

  • The correct set of four quantum numbers for the valence electrons of rubidium atom (Z=37) is

    A
    5,0,0,(+1/2)
    B
    5,1,0,(+1/2)
    C
    5,1,1,(+1/2)
    D
    5,0,1,(+1/2)

  • Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E_(g))_(C),(E_(g))_(Si) and (E_(g))_(Ge) . Which of the following statements is true?

    A
    `(E_(g))_(Si) lt (E_(g))_(Ge) lt (E_(g))_(C)`
    B
    `(E_(g))_(C) lt (E_(g))_(Ge) gt (E_(g))_(Si)`
    C
    `(E_(g))_(C) gt (E_(g))_(Si) gt (E_(g))_(Ge)`
    D
    `(E_(g))_(C) = (E_(g))_(Si) = (E_(g))_(Ge)`

  • Carbon silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E_(g))_(C), (E_(g))_(Si) " ""and" " "(E_(g))_(Ge) which of the following statements is true?

    A
    `(E_(g))_(Si)lt (E_(g))_(Ge) lt(E_(g))_(C)`
    B
    `(E_(g))_(C)lt (E_(g))_(Ge) lt(E_(g))_(Si)`
    C
    `(E_(g))_(C)gt (E_(g))_(Si) gt(E_(g))_(Ge)`
    D
    `(E_(g))_(C)=(E_(g))_(Si)=(E_(g))_(Ge)`

    • Similar Questions

    Explore conceptually related problems

    The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is

    The correct set of four quantum numbers of the valence electrons of rubidium atom (Z=37) is-

    The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is-

    Screening effect is the effect produced by intervening electrons between nucleus and valence electrons . They shield the nucleus from valence electron and effective nuclear charge decreases if there is less shielding effect the effective nuclear charge decreases Valence electrons are attracted by nucleus and repelled by other electrons. Net effective force on electrons under consideration = Z-sigma = (Nuclear charge -screening effect ) slaters formula for screening constant. If one electron is present in outermost orbit there will be no screening in that orbital. Each electrons contributes 0.35 (total electrons minus 1) present in outermost shell. In penultimate energy level electrons contribute 0.85. A contribution of 1 is from remaining electrons (present in last but one energy level) The effective nuclear charge for 4s electrons of Zn will be

    Screening effect is the effect produced by intervening electrons between nucleus and valence electrons . They shield the nucleus from valence electron and effective nuclear charge decreases if there is less shielding effect the effective nuclear charge decreases Valence electrons are attracted by nucleus and repelled by other electrons. Net effective force on electrons under consideration = Z-sigma = (Nuclear charge -screening effect ) slaters formula for screening constant. If one electron is present in outermost orbit there will be no screening in that orbital. Each electrons contributes 0.35 (total electrons minus 1) present in outermost shell. In penultimate energy level electrons contribute 0.85. A contribution of 1 is from remaining electrons (present in last but one energy level) The number of lobes in most of the f-orbitals are

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