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1.Francium is worth almost $1 billion per gram. The fact that the half-life of such an element is barely 22 minutes adds to its cost.
2. The periodic table has 118 verified elements. Ninety-Four of them are found in nature, while the rest are purely man-made. Technetium was the first element created by humans.
3. With an atomic weight of 1, hydrogen is the lightest element, hence it is placed in the periodic table's upper left corner.
4. Uranium is the heaviest element with an atomic weight of 238.
5. The Noble Gases are helium, neon, argon, krypton, xenon, and radon, which were once thought to be non-reactive. However, recent studies have discovered reactive xenon, krypton, and radon molecules.
6. The International Union of Pure Applied Chemistry (IUPAC) is responsible for maintaining the periodic table.
7. Metals constitute over 75% of the elements in the periodic table.
8. Allotropes are several types of pure elements. Diamond, graphite, buckminsterfullerene, and amorphous carbon, for example, are allotropes of the same pure element— carbon. Carbon dioxide (CO2) is a greenhouse.
9. Mendeleev's periodic table was arranged in ascending order of atomic weight, but the Modern periodic table is arranged in ascending order of atomic number.
10. Mercury and bromine are the only two elements that are liquid at room temperature.
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