The following pairs of elements have spectra that look superficially similar.

Close Resemblances
Hydrogen and Lithium
Hydrogen and Cadmium
Nitrogen and Lead
Fluorine and Protactinium
Neon and Curium
Phosphorus and Iron
Sulfur and Selenium
Scandium and Vanadium
Chromium and Dysprosium
Iron and Cerium
Iron and Neodymium
Iron and Tungsten
Copper and Einsteinium
Zinc and Cadmium
Gallium and Francium (named for the same country too!)
Arsenic and Tellurium
Krypton and Mercury
Rubidium and Plutonium
Yttrium and Ytterbium
Ruthenium and Osmium
Indium and Cesium
Barium and Lead
Cerium and Praseodymium
Cerium and Samarium
Cerium and Terbium
Cerium and Thorium
Praseodymium and Terbium
Neodymium and Terbium
Neodymium and Thorium
Europium and Ytterbium
Tungsten and Thorium
Rhenium and Bismuth
Rhenium and Polonium
Protactinium and Curium
Distant Resemblances
Helium and Sodium
Beryllium and Magnesium
Beryllium and Silver
Boron and Thallium
Carbon and Europium
Oxygen and Krypton
Fluorine and Argon
Magnesium and Aluminum
Magnesium and Silver
Magnesium and Thallium
Aluminum and Tin
Aluminum and Lead
Silicon and Germanium
Phosphorus and Zirconium
Phosphorus and Hafnium
Chlorine and Bromine
Argon and Radon
Argon and Protactinium
Potassium and Rubidium
Yttrium and Thulium
Titanium and Tungsten
Titanium and Thorium
Vanadium and Molybdenum
Vanadium and Lanthanum
Vanadium and Holmium
Chromium and Copper
Chromium and Palladium
Iron and Zirconium
Iron and Molybdenum
Iron and Praseodymium
Nickel and Tungsten
Rubidium and Francium
Molybdenum and Uranium
Cerium and Erbium
Cerium and Tungsten
Praseodymium and Samarium
Praseodymium and Europium
Praseodymium and Gadolinium
Praseodymium and Erbium
Neodymium and Gadolinium
Neodymium and Erbium
Neodymium and Uranium
Samarium and Terbium
Samarium and Erbium
Terbium and Erbium
Erbium and Thorium

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