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'''Gallium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ga. Its [[atomic number]

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The property of the unstable [[nuclei]] of chemical elements to decay into another [[isotope]], emitting energy or particles

'''Radon''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Rn. Its [[atomic number]

'''Molybdenum''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Zr. Its [[atomic number]

'''Strontium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Sr. Its [[atomic number]

'''Xenon''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Xe. Its [[atomic number]

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'''Manganese''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Mn. Its [[atomic number]

'''Osmium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Os. Its [[atomic number]

'''Niobium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Y. Its [[atomic number]]

'''Zirconium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Zr. Its [[atomic number]

'''Vanadium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] V. Its [[atomic number]]

'''Tungsten''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] W. Its [[atomic number]]

'''Chromium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Cr. Its [[atomic number]

'''Germanium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ge. Its [[atomic number]

'''Bromine''' is a [[Chemical elements|chemical element]], typically found as a [[liquid]] at room temperature in

...[neutron]]s. [[radioactivity|Radioactive]] isotopes are unstable forms of chemical elements that break down into smaller elements and release radiation in the process

'''Titanium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ti. Its [[atomic number]

'''Silicon''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Si. Its [[atomic number]

'''Helium''' is a [[Chemical elements|chemical element]], typically found as a [[gas]] in its elemental form. It

'''Magnesium''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]]

'''Beryllium''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]]

'''Sodium''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]]

'''Krypton''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Kr. Its [[atomic number]

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'''Arsenic''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] As. Its [[atomic number]

'''Americium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Am. Its [[atomic number]

'''Argon''' is a [[Chemical elements|chemical element]], typically found as a [[gas]] in its elemental form. It

'''Barium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ba. Its [[atomic number]

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'''Neptunium''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]]

'''Graphite''' is an [[allotrope]] of the [[Chemical elements|chemical element]], [[carbon]]. It is the most stable allotrope of carbon i

'''Actinium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Ac. Its [[atomic number]

'''Palladium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Pd. Its [[atomic number]

...LAY-ev), Russian chemist, discovered that ordering the then (1869) known [[chemical elements]], sixty-three in number, according to their increasing [[atomic weight]]s,

'''Yttrium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Y. Its [[atomic number]]

Caesium is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Cs. Its [[atomic number]

'''Zinc''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Zn. Its [[atomic number]

'''Potassium''' is a [[Chemical elements|chemical element]], typically found as a [[Solid_(state_of_matter)|solid]]

...ary particle]] of neutral [[charge]], normally found in the [[nucleus]] of chemical elements, but having significant effects when in free flight; the number of neutrons

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'''Rubidium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Rb. Its [[atomic number]

'''Fermium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Fm. Its [[atomic number]

The most developed form of the periodic system of chemical elements, the one canonized as the standard across the world today, emerged from the This periodic table (or periodic system) of chemical elements was widely proclaimed as the periodic Law, one of the cornerstones of the m

...Applied Chemistry</ref>) or '''aluminium''' ([[American English]]) is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Al. Its [[atomic number]

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