Electronegativity according to Pauling. 7.11 g.cm-3 at 20°C. Zinc can be a danger to unborn. Zinc group element, any of the four chemical elements that constitute Group 12 (IIb) of the periodic table—namely, zinc (Zn), cadmium (Cd), mercury (Hg), and copernicium (Cn). They have properties in common, but they also differ in significant respects. Zinc, cadmium, and mercury are metals with a.
The atomic number for zinc is 30. What are the mass numbers of the naturally occurring isotopes of zinc shown in Model 1? The mass numbers shown above are 64, 68, 67, and 66. Zinc.“Zinc, in commerce also spelter, is a chemical element with symbol Zn and atomic number 30. It is the first element of group 12 of the periodic table. In some respects zinc is chemically similar to magnesium: its ion is of similar size and its only common oxidation state is +2. Zinc is the 24th most abundant element in the. The natural abundance of Zn-64 (atomic mass m1 = 63.9291amu m 1 = 63.9291 a m u) is a1 =48.61% a 1 = 48.61%. The natural abundance of Zn-66 (atomic mass m2 = 65.9260amu m 2 = 65.9260 a m u) is a2.
| Isotope | Atomic mass (Da) | Isotopic abundance (amount fraction) |
|---|---|---|
| 64Zn | 63.929 142(5) | 0.4917(75) |
| 66Zn | 65.926 034(5) | 0.2773(98) |
| 67Zn | 66.927 127(5) | 0.0404(16) |
| 68Zn | 67.924 844(5) | 0.1845(63) |
| 70Zn | 69.925 32(2) | 0.0061(10) |
In 1961, the Commission recommended Ar(Zn) = 65.37 based on the chemical determinations. Meanwhile,mass-spectrometric determinations yielded a higher value of Ar(Zn) = 65.387.
In 1971, coulometric determinations yielded Ar(Zn) = 65.377(3), whereupon the Commission changed the recommendedvalue to 65.38(1). Soon, another mass-spectrometric value was published which yielded Ar(Zn) = 65.396(5). Faced with this ongoing discrepancy between chemical and physical values, in 1983 the Commission recommended Ar(Zn) = 65.39(2), explaining that the value was now weighted toward the mass-spectrometric measurement, but the uncertainty included the coulometric measurement. In 2001, Ar(Zn) was changed to 65.409(4) and in 2007 the Commission acknowledged that data influencing the 2001 decision could no longer be supported and recommended the current value of Ar(Zn) = 65.38(2). This change was unique in the sense that for the first time in the history of the Commission, the standard atomic weight (with its uncertainty) was outside the bounds of the previous value.
CIAAW
Zinc Element Periodic Table
Zinc
Ar(Zn) = 65.38(2) since 2007
The name derives from the German zink of unknown origin. It was first used in prehistoric times, whereits compounds were used for healing wounds and sore eyes and for making brass. Zinc was recognized asa metal as early as 1374.
Atomic Mass Of Zinc In Whole Number
Isotopic reference materials of zinc.