Astatin

Elfen gemegol ymbelydrol ydy Astatin gyda'r symbol At a'r rhif atomig 85 yn y tabl cyfnodol. Cafodd ei ddarganfod, neu ei greu, gan Dale R. Corson, Kenneth Ross MacKenzie, ac Emilio Segrè yn 1940 ac mae ei 'hanner-oes' yn funudau. Nid oes neb wedi llwyddo i'w weld neu dynnu ei lun ond credir mai lliw du sydd ganddo.

Astatin
Element 1: Hydrogen (H), Anfetelau eraill
Element 2: Helium (He), Nwyon nobl
Element 3: Lithium (Li), Metelau alcalïaidd
Element 4: Beryllium (Be), Metel daear alcalïaidd
Element 5: Boron (B), Meteloidau
Element 6: Carbon (C), Anfetelau eraill
Element 7: Nitrogen (N), Anfetelau eraill
Element 8: Oxygen (O), Anfetelau eraill
Element 9: Fluorine (F), Halogenau
Element 10: Neon (Ne), Nwyon nobl
Element 11: Sodium (Na), Metelau alcalïaidd
Element 12: Magnesium (Mg), Metel daear alcalïaidd
Element 13: Aluminium (Al), Metelau eraill
Element 14: Silicon (Si), Meteloidau
Element 15: Phosphorus (P), Anfetelau eraill
Element 16: Sulfur (S), Anfetelau eraill
Element 17: Chlorine (Cl), Halogenau
Element 18: Argon (Ar), Nwyon nobl
Element 19: Potassium (K), Metelau alcalïaidd
Element 20: Calcium (Ca), Metel daear alcalïaidd
Element 21: Scandium (Sc), Elfennau trosiannol
Element 22: Titanium (Ti), Elfennau trosiannol
Element 23: Vanadium (V), Elfennau trosiannol
Element 24: Chromium (Cr), Elfennau trosiannol
Element 25: Manganese (Mn), Elfennau trosiannol
Element 26: Iron (Fe), Elfennau trosiannol
Element 27: Cobalt (Co), Elfennau trosiannol
Element 28: Nickel (Ni), Elfennau trosiannol
Element 29: Copper (Cu), Elfennau trosiannol
Element 30: Zinc (Zn), Elfennau trosiannol
Element 31: Gallium (Ga), Metelau eraill
Element 32: Germanium (Ge), Meteloidau
Element 33: Arsenic (As), Meteloidau
Element 34: Selenium (Se), Anfetelau eraill
Element 35: Bromine (Br), Halogenau
Element 36: Krypton (Kr), Nwyon nobl
Element 37: Rubidium (Rb), Metelau alcalïaidd
Element 38: Strontium (Sr), Metel daear alcalïaidd
Element 39: Yttrium (Y), Elfennau trosiannol
Element 40: Zirconium (Zr), Elfennau trosiannol
Element 41: Niobium (Nb), Elfennau trosiannol
Element 42: Molybdenum (Mo), Elfennau trosiannol
Element 43: Technetium (Tc), Elfennau trosiannol
Element 44: Ruthenium (Ru), Elfennau trosiannol
Element 45: Rhodium (Rh), Elfennau trosiannol
Element 46: Palladium (Pd), Elfennau trosiannol
Element 47: Silver (Ag), Elfennau trosiannol
Element 48: Cadmium (Cd), Elfennau trosiannol
Element 49: Indium (In), Metelau eraill
Element 50: Tin (Sn), Metelau eraill
Element 51: Antimony (Sb), Meteloidau
Element 52: Tellurium (Te), Meteloidau
Element 53: Iodine (I), Halogenau
Element 54: Xenon (Xe), Nwyon nobl
Element 55: Caesium (Cs), Metelau alcalïaidd
Element 56: Barium (Ba), Metel daear alcalïaidd
Element 57: Lanthanum (La), Lanthanidau
Element 58: Cerium (Ce), Lanthanidau
Element 59: Praseodymium (Pr), Lanthanidau
Element 60: Neodymium (Nd), Lanthanidau
Element 61: Promethium (Pm), Lanthanidau
Element 62: Samarium (Sm), Lanthanidau
Element 63: Europium (Eu), Lanthanidau
Element 64: Gadolinium (Gd), Lanthanidau
Element 65: Terbium (Tb), Lanthanidau
Element 66: Dysprosium (Dy), Lanthanidau
Element 67: Holmium (Ho), Lanthanidau
Element 68: Erbium (Er), Lanthanidau
Element 69: Thulium (Tm), Lanthanidau
Element 70: Ytterbium (Yb), Lanthanidau
Element 71: Lutetium (Lu), Lanthanidau
Element 72: Hafnium (Hf), Elfennau trosiannol
Element 73: Tantalum (Ta), Elfennau trosiannol
Element 74: Tungsten (W), Elfennau trosiannol
Element 75: Rhenium (Re), Elfennau trosiannol
Element 76: Osmium (Os), Elfennau trosiannol
Element 77: Iridium (Ir), Elfennau trosiannol
Element 78: Platinum (Pt), Elfennau trosiannol
Element 79: Gold (Au), Elfennau trosiannol
Element 80: Mercury (Hg), Elfennau trosiannol
Element 81: Thallium (Tl), Metelau eraill
Element 82: Lead (Pb), Metelau eraill
Element 83: Bismuth (Bi), Metelau eraill
Element 84: Polonium (Po), Meteloidau
Element 85: Astatine (At), Halogenau
Element 86: Radon (Rn), Nwyon nobl
Element 87: Francium (Fr), Metelau alcalïaidd
Element 88: Radium (Ra), Metel daear alcalïaidd
Element 89: Actinium (Ac), Actinidau
Element 90: Thorium (Th), Actinidau
Element 91: Protactinium (Pa), Actinidau
Element 92: Uranium (U), Actinidau
Element 93: Neptunium (Np), Actinidau
Element 94: Plutonium (Pu), Actinidau
Element 95: Americium (Am), Actinidau
Element 96: Curium (Cm), Actinidau
Element 97: Berkelium (Bk), Actinidau
Element 98: Californium (Cf), Actinidau
Element 99: Einsteinium (Es), Actinidau
Element 100: Fermium (Fm), Actinidau
Element 101: Mendelevium (Md), Actinidau
Element 102: Nobelium (No), Actinidau
Element 103: Lawrencium (Lr), Actinidau
Element 104: Rutherfordium (Rf), Elfennau trosiannol
Element 105: Dubnium (Db), Elfennau trosiannol
Element 106: Seaborgium (Sg), Elfennau trosiannol
Element 107: Bohrium (Bh), Elfennau trosiannol
Element 108: Hassium (Hs), Elfennau trosiannol
Element 109: Meitnerium (Mt)
Element 110: Darmstadtium (Ds)
Element 111: Roentgenium (Rg)
Element 112: Copernicium (Cn), Elfennau trosiannol
Element 113: Nihonium (Nh)
Element 114: Flerovium (Fl)
Element 115: Moscovium (Mc)
Element 116: Livermorium (Lv)
Element 117: Tennessine (Ts)
Element 118: Oganesson (Og)
Astatin
Astatin mewn cynhwysydd
At-TableImage.svg
Symbol At
Rhif 85
Dwysedd 2.70 g/cm³
Chem template.svg Eginyn erthygl sydd uchod am gemeg. Gallwch helpu Wicipedia drwy ychwanegu ato.
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Chwiliwch am astatin
yn Wiciadur.
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