# Dictionary of elements and their densities in g/cm^3
elements = {
    'Hydrogen': 0.00008988,
    'Helium': 0.0001785,
    'Lithium': 0.534,
    'Beryllium': 1.85,
    'Boron': 2.34,
    'Carbon': 2.267,
    'Nitrogen': 0.0012506,
    'Oxygen': 0.001429,
    'Fluorine': 0.001696,
    'Neon': 0.0008999,
    'Sodium': 0.971,
    'Magnesium': 1.738,
    'Aluminum': 2.70,
    'Silicon': 2.33,
    'Phosphorus': 1.82,
    'Sulfur': 2.07,
    'Chlorine': 0.003214,
    'Argon': 0.0017837,
    'Potassium': 0.862,
    'Calcium': 1.54,
    'Scandium': 2.99,
    'Titanium': 4.54,
    'Vanadium': 6.11,
    'Chromium': 7.19,
    'Manganese': 7.21,
    'Iron': 7.874,
    'Cobalt': 8.9,
    'Nickel': 8.908,
    'Copper': 8.96,
    'Zinc': 7.134,
    'Gallium': 5.904,
    'Germanium': 5.323,
    'Arsenic': 5.776,
    'Selenium': 4.809,
    'Bromine': 3.1028,
    'Krypton': 0.003733,
    'Rubidium': 1.532,
    'Strontium': 2.64,
    'Yttrium': 4.472,
    'Zirconium': 6.52,
    'Niobium': 8.57,
    'Molybdenum': 10.22,
    'Technetium': 11.5,
    'Ruthenium': 12.1,
    'Rhodium': 12.41,
    'Palladium': 12.023,
    'Silver': 10.49,
    'Cadmium': 8.69,
    'Indium': 7.31,
    'Tin': 7.287,
    'Antimony': 6.685,
    'Tellurium': 6.24,
    'Iodine': 4.933,
    'Xenon': 0.005887,
    'Cesium': 1.93,
    'Barium': 3.62,
    'Lanthanum': 6.162,
    'Cerium': 6.77,
    'Praseodymium': 6.773,
    'Neodymium': 7.007,
    'Promethium': 7.26,
    'Samarium': 7.52,
    'Europium': 5.243,
    'Gadolinium': 7.895,
    'Terbium': 8.229,
    'Dysprosium': 8.55,
    'Holmium': 8.795,
    'Erbium': 9.066,
    'Thulium': 9.321,
    'Ytterbium': 6.965,
    'Lutetium': 9.84,
    'Hafnium': 13.31,
    'Tantalum': 16.654,
    'Tungsten': 19.25,
    'Rhenium': 21.02,
    'Osmium': 22.59,
    'Iridium': 22.56,
    'Platinum': 21.45,
    'Gold': 19.3,
    'Mercury': 13.5336,
    'Thallium': 11.85,
    'Lead': 11.342,
    'Bismuth': 9.78,
    'Polonium': 9.32,
    'Astatine': 7.0,
    'Radon': 0.00973,
    'Francium': 1.87,
    'Radium': 5.5,
    'Actinium': 10.07,
    'Thorium': 11.72,
    'Protactinium': 15.37,
    'Uranium': 18.95,
    'Neptunium': 20.45,
    'Plutonium': 19.84,
    'Americium': 13.69,
    'Curium': 13.51,
    'Berkelium': 14.78,
    'Californium': 15.1,
    'Einsteinium': 8.84,
    'Fermium': 9.7,
    'Mendelevium': 10.3,
    'Nobelium': 9.9,
    'Lawrencium': 15.6,
    'Rutherfordium': 23.2,  # estimated
    'Dubnium': 29.3,  # estimated
    'Seaborgium': 35.0,  # estimated
    'Bohrium': 37.1,  # estimated
    'Hassium': 41.0,  # estimated
    'Meitnerium': 37.4,  # estimated
    'Darmstadtium': 34.8,  # estimated
    'Roentgenium': 28.7,  # estimated
    'Copernicium': 23.7,  # estimated
}

# Sort elements by density
sorted_elements = sorted(elements.items(), key=lambda x: x[1])

# Print sorted elements
for element, density in sorted_elements:
    print(f"{element}: {density} g/cm^3")