When the alkali metals react with the different halogens (Group 7 of the periodic table), the group of compounds formed are known as the alkali metals halides. Due to the fact that there are a ...

Mendeleev discovered the periodic table (or Periodic System, as he called it ... but Mendeleev saw that iodine was very similar to the rest of the halogens (fluorine, chlorine, bromine), and tellurium ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

In 1869, Mendeleev's first periodic table did not include them ... But Ramsey established their position between halogens and alkali metals, and was awarded the Nobel Prize in Chemistry in ...