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How many neutrons are in sodiums most common isotpe?
12
What does it mean for an isotpe to be radioactive?
It means that particular combination of protons and neutrons is not stable.
Does a sodium atom have fewer neutrons in its nucleus than an iron atom?
Yes. Sodium has 12 neutrons whereas iron has 30 neutrons for their most stable isotpe.
What are synthetic radioactive elements?
There are several possibilities for elements that are always radioactive and are artificially produced: Technetium Promethium Any element with atomic number 92 (plutonium) or heavier. There are approx 25 of these in existence up to element 118 (element 117 has not been made yet). Additionally, it could be argued that plutonium is found naturally. But only the faintest traces can be found, and could be said to be produced artificially via neutron capture by uranium. It might be (and probably is) possible to create technitium or promethium in the same manner if precursor nuclei for those elements are found with naturally occurring uranium. Neutron capture is possible across a fairly wide range of elements.
What is more radioactive uranium or plutonium?
There are numerous isotopes of both plutonium and uranium ( all radioactive) thus it is not easy to say which element is more radioactive. However the half lives of the most active isotpe of each compound is follows241Pu has a half life of 14 years232U has a half life of 68.9 yearsSo in terms of activity, Plutonium is more radioactive; however uranium stays radioactive for a longer time.The specific activity of plutonium is greater than the specific activity of uranium (comparison between 239Pu and 238U).
What is the isotpe of uranium?
Isotopes of uranium:Nr. crt.IsotopeMasa atomică relativă1.217U217,024 368 791 ± 0,000 093 2622.218U218,023 535 671 ± 0,000 032 763 3.219U219,024 919 160 ± 0,000 060 9464.220U220,024 723# ± 0,000 215#5.221U221,026 399# ± 0,000 110#6.222U222,026 086# ± 0,000 108#7.223U223,027 738 600 ± 0,000 076 3478.224U224,027 604 778 ± 0,000 027 1769.225U225,029 390 717 ± 0,000 012 42810.226U226,029 338 702 ± 0,000 013 99911.227U227,031 156 367 ± 0,000 018 10412.228U228,031 374 006 ± 0,000 016 05113.229U229,033 505 939 ± 0,000 006 39614.230U230,033 939 784 ± 0,000 005 11015.231U231,036 293 704 ± 0,000 003 24216.232U232,037 156 152 ± 0,000 002 36517.233U233,039 635 207 ± 0,000 002 90418. ** natural234U234,040 952 088 ± 0,000 001 96019. ** natural235U235,043 929 918 ± 0,000 001 95720.235mU"21.236U236,045 568 006 ± 0,000 001 96022.237U237,048 730 184 ± 0,000 002 01923. ** natural238U238,050 788 247 ± 0,000 002 04424.238m1U" 25.238m2U"26.239U239,054 293 299 ± 0,000 002 05227.240U240,056 591 988 ± 0,000 005 53328.241U241,060 330# ± 0,000 320#29.242U242,062 931# ± 0,000 215#30. *** unsure243U243,067 3631. *** unsure244U244,069 95
If an atom has 43 electrons and 56 neutrons and 43 protons what is its approximate atomic mass?
Atomic mass of an element is measured in atomic mass units (amu), and is usually only slightly higher than its atomic mass number (except for elements having many different isotopes). The mass of a neutron is 1.00866 amu and the mass of a proton is 1.00728 amu. The mass of electrons is so insignificant that they are ignored. The atomic mass of an atom with 56 neutrons and 43 protons is (56 x 1.00866 amu) + (43 x 1.00728 amu) = ~99.8 amu.
