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{{r|Atomic number}}

...ical elements|chemical element]], having the [[chemical symbol]] Al. Its [[atomic number]] (the number of [[proton]]s) is 13. It has a [[Atomic mass#Standard atomic

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...ical elements|chemical element]], having the [[chemical symbol]] Ac. Its [[atomic number]] (the number of [[proton]]s) is 89. It has a [[Atomic mass#Standard atomic

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...erial are called [[fission product]]s. The parent nuclei are of such high atomic number that they are [[radioactive]], although their decay, typically [[alpha part

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...d as a [[gas]] in its elemental form. It has the [[chemical symbol]] Cl, [[atomic number]] (number of [[protons]]) ''Z'' = 17, and a [[Atomic mass#Standar

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...ntal form. It has the [[chemical symbol]] K (from the Latin ''kalium''), [[atomic number]] (number of [[protons]]) ''Z'' = 19, and a [[Atomic mass#Standar

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[[Beryllium]], an element with a low-Z (atomic number), is an effective reflector of [[neutron]]s; by surrounding a [[fission dev