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Element

Screening Percentage

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Aluminum

73.1%

Antimony

80.8%

Argon

58.6%

Arsenic

70.3%

Astatine

81.9%

Barium

94.9%

Beryllium

51.3%

Bismuth

83.0%

Boron

48.0%

Bromine

68.3%

Cadmium

83.6%

Calcium

85.8%

Carbon

45.8%

Cerium

93.7%

Cesium

96.0%

Chlorine

64.1%

Chromium

80.4%

Cobalt

76.5%

Copper

75.2%

Dysprosium

90.9%

Erbium

90.3%

Europium

92.0%

Fluorine

43.2%

Gadolinium

91.3%

Gallium

72.5%

Germanium

71.4%

Gold

85.4%

Hafnium

88.6%

Helium

15.0%

Holmium

90.6%

Hydrogen

 0.0%

Indium

82.6%

Iodine

79.0%

Iridium

86.1%

Iron

77.5%

Krypton

67.4%

Lanthanum

94.1%

Lead

83.6%

Lithium

56.7%

Lutetium

89.1%

Magnesium

76.2%

Manganese

78.6%

Mercury

84.7%

Molybdenum

88.8%

Neodymium

93.1%

Neon

41.5%

Nickel

75.5%

Niobium

89.7%

Nitrogen

44.3%

Osmium

86.6%

Oxygen

43.1%

Palladium

85.1%

Phosphorus

68.0%

Platinum

85.8%

Polonium

82.4%

Potassium

88.4%

Praseodymium

93.5%

Promethium

92.7%

Radon

81.3%

Rhenium

87.1%

Rhodium

86.2%

Rubidium

94.0%

Ruthenium

87.0%

Samarium

92.3%

Scandium

84.0%

Selenium

69.3%

Silicon

70.4%

Silver

84.7%

Sodium

80.0%

Strontium

92.5%

Sulfur

65.9%

Tantalum

88.1%

Technetium

87.5%

Tellurium

79.9%

Terbium

91.3%

Thallium

84.2%

Thulium

90.0%

Tin

81.7%

Titanium

82.5%

Tungsten

87.6%

Vanadium

81.1%

Xenon

78.2%

Ytterbium

89.7%

Yttrium

91.4%

Zinc

73.8%

Zirconium

90.4%

Reference    (Click the button next to a value above to see complete citation information for that entry)

Waldron, Kimberley A., Erin M. Fehringer, Amy E. Streeb, Jennifer E. Trosky, and Joshua J. Pearson. "Screening Percentages Based on Slater Effective Nuclear Charge as a Versatile Tool for Teaching Periodic Trends." Journal of Chemical Education, volume 78, number 5, 2001, pp. 635–639. doi:10.1021/ed078p635