<Table> <Tr> <Th_colspan="2"> Alkali metals </Th> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> Hydrogen </Td> <Td_colspan="30"> </Td> <Td> Helium </Td> </Tr> <Tr> <Td> Lithium </Td> <Td> Beryllium </Td> <Td_colspan="24"> </Td> <Td> Boron </Td> <Td> Carbon </Td> <Td> Nitrogen </Td> <Td> Oxygen </Td> <Td> Fluorine </Td> <Td> Neon </Td> </Tr> <Tr> <Td> Sodium </Td> <Td> Magnesium </Td> <Td_colspan="24"> </Td> <Td> Aluminium </Td> <Td> Silicon </Td> <Td> Phosphorus </Td> <Td> Sulfur </Td> <Td> Chlorine </Td> <Td> Argon </Td> </Tr> <Tr> <Td> Potassium </Td> <Td> Calcium </Td> <Td> Scandium </Td> <Td_colspan="14"> </Td> <Td> Titanium </Td> <Td> Vanadium </Td> <Td> Chromium </Td> <Td> Manganese </Td> <Td> Iron </Td> <Td> Cobalt </Td> <Td> Nickel </Td> <Td> Copper </Td> <Td> Zinc </Td> <Td> Gallium </Td> <Td> Germanium </Td> <Td> Arsenic </Td> <Td> Selenium </Td> <Td> Bromine </Td> <Td> Krypton </Td> </Tr> <Tr> <Td> Rubidium </Td> <Td> Strontium </Td> <Td> Yttrium </Td> <Td> </Td> <Td_colspan="13"> </Td> <Td> Zirconium </Td> <Td> Niobium </Td> <Td> Molybdenum </Td> <Td> Technetium </Td> <Td> Ruthenium </Td> <Td> Rhodium </Td> <Td> Palladium </Td> <Td> Silver </Td> <Td> Cadmium </Td> <Td> Indium </Td> <Td> Tin </Td> <Td> Antimony </Td> <Td> Tellurium </Td> <Td> Iodine </Td> <Td> Xenon </Td> </Tr> <Tr> <Td> Caesium </Td> <Td> Barium </Td> <Td> Lanthanum </Td> <Td> Cerium </Td> <Td> Praseodymium </Td> <Td> Neodymium </Td> <Td> Promethium </Td> <Td> Samarium </Td> <Td> Europium </Td> <Td> Gadolinium </Td> <Td> Terbium </Td> <Td> Dysprosium </Td> <Td> Holmium </Td> <Td> Erbium </Td> <Td> Thulium </Td> <Td> Ytterbium </Td> <Td> Lutetium </Td> <Td> Hafnium </Td> <Td> Tantalum </Td> <Td> Tungsten </Td> <Td> Rhenium </Td> <Td> Osmium </Td> <Td> Iridium </Td> <Td> Platinum </Td> <Td> Gold </Td> <Td> Mercury (element) </Td> <Td> Thallium </Td> <Td> Lead </Td> <Td> Bismuth </Td> <Td> Polonium </Td> <Td> Astatine </Td> <Td> Radon </Td> </Tr> <Tr> <Td> Francium </Td> <Td> Radium </Td> <Td> Actinium </Td> <Td> Thorium </Td> <Td> Protactinium </Td> <Td> Uranium </Td> <Td> Neptunium </Td> <Td> Plutonium </Td> <Td> Americium </Td> <Td> Curium </Td> <Td> Berkelium </Td> <Td> Californium </Td> <Td> Einsteinium </Td> <Td> Fermium </Td> <Td> Mendelevium </Td> <Td> Nobelium </Td> <Td> Lawrencium </Td> <Td> Rutherfordium </Td> <Td> Dubnium </Td> <Td> Seaborgium </Td> <Td> Bohrium </Td> <Td> Hassium </Td> <Td> Meitnerium </Td> <Td> Darmstadtium </Td> <Td> Roentgenium </Td> <Td> Copernicium </Td> <Td> Nihonium </Td> <Td> Flerovium </Td> <Td> Moscovium </Td> <Td> Livermorium </Td> <Td> Tennessine </Td> <Td> Oganesson </Td> </Tr> </Table> noble gases ← → alkaline earth metals </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> IUPAC group number </Th> <Th> </Th> </Tr> <Tr> <Td> Name by element </Td> <Td> lithium group </Td> </Tr> <Tr> <Td> Trivial name </Td> <Td> alkali metals </Td> </Tr> <Tr> <Td> CAS group number (US, pattern A-B-A) </Td> <Td> IA </Td> </Tr> <Tr> <Td> old IUPAC number (Europe, pattern A-B) </Td> <Td> IA </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> ↓ Period </Th> </Tr> <Tr> <Th> </Th> <Td> Lithium (Li) </Td> </Tr> <Tr> <Th> </Th> <Td> Sodium (Na) 11 </Td> </Tr> <Tr> <Th> </Th> <Td> Potassium (K) 19 </Td> </Tr> <Tr> <Th> 5 </Th> <Td> Rubidium (Rb) 37 </Td> </Tr> <Tr> <Th> 6 </Th> <Td> Caesium (Cs) 55 </Td> </Tr> <Tr> <Th> 7 </Th> <Td> Francium (Fr) 87 </Td> </Tr> <Tr> <Td_colspan="2"> <P> Legend </P> <Table> <Tr> <Td> primordial </Td> </Tr> <Tr> <Td> element by radioactive decay </Td> </Tr> <Tr> <Td> Atomic number color: black = solid </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Alkali metals </Th> </Tr>

The alkali metals are located in which group of the periodic table
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