The periodic table of elements contains information about the 118 elements found on Earth. The first periodic table was arranged in a grid system and developed by Dmitri Mendeleev in 1869. Most of the elements found in the periodic table are metals. These naturally occurring metals are arranged in certain groups based on their properties and atomic number.
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Alkali and Alkali Earth Metals
Alkali metals are highly reactive elements with low melting points and low densities. The high reactivity is due to the willingness of the elements to give up an electron and become positive ions. The alkali metals react to water to form strong alkaline hydroxides. These metals include lithium, sodium, potassium, rubidium, caesium, francium, beryllium, magnesium, calcium, strontium, barium and radium.
Rare Earth Metals
The rare earth metals are found in the lanthanide and actinide series on the periodic table. These metals are silvery-white or grey and tarnish in the air. They conduct electricity and are difficult to separate from each other. The rare earth metals are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, actinium, thorium, protactinium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium and lawrencium.
Transition and Other Metals
Transition metals are those metals having ductile properties (can be pressed or pulled) and that are malleable (easily shaped). They conduct electricity and heat and can have several oxidation states (share electrons). Transition metals include zinc, molybdenum, cadmium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, yttrium, zirconium, niobium, technetium, ruthenium, rhodium, palladium, silver, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, copernicium, aluminium, gallium, indium, tin, thallium, lead, bismuth, ununtrium, ununquadium, ununpentium and ununhexium.
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