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...ical elements|chemical element]], having the [[chemical symbol]] Kr. Its [[atomic number]] (the number of [[proton]]s) is 36. It has a [[Atomic mass#Standard atomic

...atter)|solid]] in its elemental form. It has the [[chemical symbol]] Pt, [[atomic number]] (number of [[protons]]) ''Z'' = 78, and a [[Atomic mass#Standar

...ical elements|chemical element]], having the [[chemical symbol]] As. Its [[atomic number]] (the number of [[proton]]s) is 33. It has a [[Atomic mass#Standard atomic

...ry hard, brittle, silvery-white transition metal and chemical element with atomic number 77, and is represented by the symbol Ir.

A rare chemical element ([[atomic number]] = 5) present in 0.0003% of the earth's crust, mostly as [[borax]] and [[k

The most abundant and lightest chemical element which has atomic number Z = 1 and chemical symbol H.

{{r|Atomic number}}

...ical elements|chemical element]], having the [[chemical symbol]] Os. Its [[atomic number]] (the number of [[proton]]s) is 76. It has a [[Atomic mass#Standard atomic

The group of [[f-block]] [[chemical element]]s with [[atomic number]]s between 58 ([[cerium]]) and 71 ([[lutetium]]); named after [[lanthanum]]

...ical elements|chemical element]], having the [[chemical symbol]] Zr. Its [[atomic number]] (the number of [[proton]]s) is 40. It has a [[Atomic mass#Standard atomic

...d as a [[gas]] in its elemental form. It has the [[chemical symbol]] Ar, [[atomic number]] (number of [[protons]]) ''Z'' = 18, and a [[Atomic mass#Standard atomic w

...πο, "same place") are forms of [[chemical elements]] which have the same [[atomic number]] but a different [[atomic mass]], or in other words the same number of [[p

...mical elements|chemical element]], having the [[chemical symbol]] W. Its [[atomic number]] (the number of [[proton]]s) is 74. It has a [[Atomic mass#Standard atomic

...ent in the actinide series of the periodic table that has the symbol U and atomic number 92.

...l elements|chemical element]], having the [[chemical symbol]] Md and its [[atomic number]] (the number of [[proton]]s) is 101. It has a [[Atomic mass#Standard atomi

...ical elements|chemical element]], having the [[chemical symbol]] Si. Its [[atomic number]] (the number of [[proton]]s) is 14. It has a [[Atomic mass#Standard atomic

{{r|Atomic number}}

{{r|Atomic number}}

...ical elements|chemical element]], having the [[chemical symbol]] Rb. Its [[atomic number]] (the number of [[proton]]s) is 37. It has a [[Atomic mass#Standard atomic

...atter)|solid]] in its elemental form. It has the [[chemical symbol]] Mg, [[atomic number]] (number of [[protons]]) ''Z'' = 12, and a [[Atomic mass#Standar