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    which element has the highest ionization energy

    Mohammed

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    The Parts of the Periodic Table

    Data taken from John Emsley, , 3rd edition.  Oxford:  Clarendon Press, 1998.

    The ionization energy of an atom is the amount of energy that is required to remove an electron from a mole of atoms in the gas phase:

    M(g)  ®  M+(g)  +  -

    It is possible to remove more electrons from most elements, so this quantity is more precisely known as the first ionization energy, the energy to go from neutral atoms to cations with a 1+ charge.  The second ionization energy is the energy that is required to remove a second electron, to form 2+ cations from 1+ cations:

    M+(g)  ®  M2+(g)  +  -

    The third ionization energy is the energy required to form 3+ cations:

    M2+(g)  ®  M3+(g)  +  -

    and so on.  Ionization energies are always numbers, because energy must be supplied (an endothermic energy change) to separate electrons from atoms.  The second ionization energy is always larger than the first ionization energy, because it requires even more energy to remove an electron from a cation than it is from a neutral atom.

    The first ionization energy varies in a predictable way across the periodic table.  The ionization energy , and .  Thus, helium has the largest first ionization energy, while francium has one of the lowest.

    From top to bottom in a group, orbitals corresponding to higher values of the principal quantum number () are being added, which are on average further away from the nucleus.  Since the outermost electrons are further away, they are less strongly attracted by the nucleus, and are easier to remove, corresponding to a lower value for the first ionization energy.

    From left to right across a period, more protons are being added to the nucleus, but the number of electrons in the inner, lower-energy shells remains the same.  The valence electrons feel a higher — the sum of the charges on the protons in the nucleus and the charges on the inner, core electrons.  The valence electrons are therefore held more tightly, the atom decreases in size (see atomic radius), and it becomes increasingly difficult to remove them, corresponding to a higher value for the first ionization energy.

    The following charts illustrate the general trends in the first ionization energy:

    स्रोत : www.angelo.edu

    List of Elements in Order of Ionization Energy (eV)

    List of chemical elements in order of ionization energy. Learn the ionization energy of the elements in periodic table and list atomic numbers and chemical symbols.

    List of Elements in Order of Ionization Energy (eV)

    List of elements ordered by ionization energy is listed in the table below with atomic number, chemical symbol and ionization energy (eV). To list the elements order by ionization energy, click on the table headers. You can print the list of elements by hitting the print button below.

    The element which has the highest ionization energy is Helium with 24.58741 eV. And the element which has the lowest ionization energy is Caesium in 3.8939 eV.

    Atomic Number Chemical Symbol Element Name Ionization Energy (eV)

    2 He Helium 24.58741

    10 Ne Neon 21.5646

    9 F Fluorine 17.42282

    18 Ar Argon 15.75962

    7 N Nitrogen 14.53414

    36 Kr Krypton 13.99961

    8 O Oxygen 13.61806

    1 H Hydrogen 13.59844

    17 Cl Chlorine 12.96764

    54 Xe Xenon 12.1298

    35 Br Bromine 11.81381

    6 C Carbon 11.2603 86 Rn Radon 10.7485

    15 P Phosphorus 10.48669

    53 I Iodine 10.45126

    80 Hg Mercury 10.4375

    16 S Sulfur 10.36001

    33 As Arsenic 9.7886

    34 Se Selenium 9.75238

    30 Zn Zinc 9.3942

    4 Be Beryllium 9.3227

    79 Au Gold 9.2255

    52 Te Tellurium 9.0096

    48 Cd Cadmium 8.9938

    77 Ir Iridium 8.967

    78 Pt Platinum 8.9587

    51 Sb Antimony 8.6084

    76 Os Osmium 8.4382

    84 Po Polonium 8.417

    46 Pd Palladium 8.3369

    5 B Boron 8.29803

    14 Si Silicon 8.15169

    26 Fe Iron 7.9024

    32 Ge Germanium 7.8994

    28 Ni Nickel 7.881 74 W Tungsten 7.864

    75 Re Rhenium 7.8335

    29 Cu Copper 7.72638

    12 Mg Magnesium 7.64624

    27 Co Cobalt 7.6398 47 Ag Silver 7.5762

    73 Ta Tantalum 7.5496

    45 Rh Rhodium 7.4589

    25 Mn Manganese 7.43402

    82 Pb Lead 7.41666

    44 Ru Ruthenium 7.3605

    50 Sn Tin 7.3439

    83 Bi Bismuth 7.2856

    43 Tc Technetium 7.28

    42 Mo Molybdenum 7.09243

    22 Ti Titanium 6.8281

    72 Hf Hafnium 6.82507

    24 Cr Chromium 6.7665

    41 Nb Niobium 6.75885

    23 V Vanadium 6.7462

    102 No Nobelium 6.65

    40 Zr Zirconium 6.6339

    101 Md Mendelevium 6.58

    21 Sc Scandium 6.5615

    100 Fm Fermium 6.5

    99 Es Einsteinium 6.42

    90 Th Thorium 6.3067

    98 Cf Californium 6.2817

    93 Np Neptunium 6.2657

    70 Yb Ytterbium 6.25416

    39 Y Yttrium 6.2171

    97 Bk Berkelium 6.1979

    92 U Uranium 6.19405

    69 Tm Thulium 6.18431

    64 Gd Gadolinium 6.1501

    20 Ca Calcium 6.11316

    81 Tl Thallium 6.1082

    68 Er Erbium 6.1077

    94 Pu Plutonium 6.0262

    67 Ho Holmium 6.0215

    104 Rf Rutherfordium 6

    31 Ga Gallium 5.9993

    96 Cm Curium 5.9915

    13 Al Aluminium 5.98577

    95 Am Americium 5.9738

    66 Dy Dysprosium 5.9389

    91 Pa Protactinium 5.89

    65 Tb Terbium 5.8638

    49 In Indium 5.78636

    38 Sr Strontium 5.6949

    63 Eu Europium 5.6704

    62 Sm Samarium 5.6436

    61 Pm Promethium 5.582

    57 La Lanthanum 5.5769

    58 Ce Cerium 5.5387

    60 Nd Neodymium 5.525

    59 Pr Praseodymium 5.473

    71 Lu Lutetium 5.4259

    3 Li Lithium 5.39172

    88 Ra Radium 5.2784 56 Ba Barium 5.2117 89 Ac Actinium 5.17

    11 Na Sodium 5.13908

    103 Lr Lawrencium 4.9

    19 K Potassium 4.34066

    37 Rb Rubidium 4.17713

    87 Fr Francium 4.0727

    55 Cs Caesium 3.8939

    स्रोत : www.atomicnumber.net

    What elements have the highest ionisation energy ?

    What elements have the highest ionisation energy ?

    Byju's Answer Standard X Chemistry Metals What elements... Question

    What elements have the highest ionisation energy ?

    Open in App Solution

    Ionisation energy is the quantity of energy needed to remove an electron from an atom.

    The ionisation energy of an atom is directly proportional to the effective nuclear charge of an atom/ion.

    Hence, ionisation increases left to right in a period and is observed to be highest for noble gases.

    Noble gases are a stable system with a complete octet and hence will require the highest energy to remove an electron.

    Example: Argon (Ar), Neon (Ne)

    Therefore, noble gases will have the highest ionisation energy.

    Suggest Corrections 9

    SIMILAR QUESTIONS

    Q.

    The element having highest ionisation potential is:

    Q. Which element has the highest ionisation energy and lowest ionisation energy?Q.

    Amongst the following elements (whose electronic configurations are given below), the one having the highest ionisation energy is

    Q.

    Amongst the elements with following electronic configurations, which one may have the highest ionisation energy? [CBSE AIPMT 2009]

    Q. Which element having highest ionisation energy ?

    View More EXPLORE MORE Metals

    Standard X Chemistry

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