Periodic Table of Elements
Simple version with Actomic number and Weight
| Alkali Metal | Alkaline earth metal | Lanthanide | Actinide | Transition metal |
| Post-transition metal | Metalloid | Nonmetal | Reactive nonmetal | Noble gas |
| Unknown chemical properties |
Occurences in nature
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Standard conditions for temperature and pressure
Standard conditions for temperature and pressure are standard sets of conditions for experimental measurements to be established to allow comparisons to be made between different sets of data.
Standard temperature and pressure are also commonly referred to as standard conditions. Standard conditions may also include standard relative humidity.
Many definitions are also being used by other organizations regarding standard conditions (see table below); in which sometimes the concept of room temperature (about 25 degrees Celsius) is used instead of 0 degrees Celsius.
Alkali metal
Alkali metals are groups of elements in group 1 of the periodic table of chemical elements (except hydrogen). These elements are highly active and are rarely found in their pure form in nature.
Common characteristics of these alkali metals are: silvery white, soft with low specific gravity. Immediately react to elemental halogen.
Alkaline metal earth
These metals are referred to as alkaline earth because of their intermediate nature properties between alkalis (oxide of alkali metals) and rare earths (oxide of rare earth metals).
Transition metal
The transition metal is 68 chemical elements with atomic numbers from 21 to 30, 39 to 48, 57 to 80 and 89 to 112. The reason for this name is their position in the periodic table because it captures beginning of the transition due to the addition of electrons in the atomic orbit of class d.
If more strictly defined, transition metals are elements that form at least one ion with a partially filled orbital (orbital) d, i.e., d-element elements except scandium and zinc.
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