Actinium
Actinium is the third element in Row 7 of the periodic table. Its atomic number is 89 and chemical symbol is Ac. Actinium is a radioactive element, whose most common isotope has a mass of 227...
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Actinium
Actinium (chemical symbol: Ac) has an atomic number of 89, making it the first member of the second family of rare earth-like elements known as the actinides. All elements in this family, inc...
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Actinium
Symbol
Ac
Atomic Number
89
Atomic Mass
227.0278
Family
Group 3 (IIIB) Transition metal
Pronunciation
ack-TIN-ee-um
Overview
Actinium is the third element in Row 7 of the periodic table, a ch...
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Actinium
Symbol
Kr
Atomic Number
36
Atomic Mass
83.80
Family
Group 18 (Viiia) Noble Gas Pronunciation
KRIP-ton
Overview
Krypton was one of three noble gases discovered in 1898 by Scottish chemist and...
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Actinium
Actinium
Actinium