91Ó°ÊÓ

What is the current atomic mass scale reference isotope?

Given that the only naturally occurring isotope of sodium is \({ }^{23} \mathrm{Na},\) determine its mass from the periodic table.

Given that the only naturally occurring isotope of fluorine \({ }^{19} \mathrm{~F},\) determine its mass from the periodic table.

Given that the only naturally occurring isotope of phosphorus is \({ }^{31} \mathrm{P}\), determine its mass from the periodic table

Calculate the atomic mass for lithium given the following data for its natural isotopes: $$ \begin{array}{rrr} { }^{6} \mathrm{Li} & 6.015 \mathrm{amu} & 7.42 \% \\ { }^{7} \mathrm{Li} & 7.016 \mathrm{amu} & 92.58 \% \end{array} $$

Calculate the atomic mass for magnesium given the following data for its natural isotopes: $$ \begin{array}{lll} { }^{24} \mathrm{Mg} & 23.985 \mathrm{amu} & 78.70 \% \\ { }^{25} \mathrm{Mg} & 24.986 \mathrm{amu} & 10.13 \% \\ { }^{26} \mathrm{Mg} & 25.983 \mathrm{amu} & 11.17 \% \end{array} $$

Calculate the atomic mass for iron given the following data for its natural isotopes: $$ \begin{array}{llc} { }^{54} \mathrm{Fe} & 53.940 \mathrm{amu} & 5.82 \% \\ { }^{56} \mathrm{Fe} & 55.935 \mathrm{amu} & 91.66 \% \\ { }^{57} \mathrm{Fe} & 56.935 \mathrm{amu} & 2.19 \% \\ { }^{58} \mathrm{Fe} & 57.933 \mathrm{amu} & 0.33 \% \end{array} $$

Calculate the atomic mass for zinc given the following data for its natural isotopes: $$ \begin{array}{llr} { }^{64} \mathrm{Zn} & 63.929 \mathrm{amu} & 48.89 \% \\ { }^{66} \mathrm{Zn} & 65.926 \mathrm{amu} & 27.81 \% \\ { }^{67} \mathrm{Zn} & 66.927 \mathrm{amu} & 4.11 \% \\ { }^{68} \mathrm{Zn} & 67.925 \mathrm{amu} & 18.57 \% \\ { }^{70} \mathrm{Zn} & 69.925 \mathrm{amu} & 0.62 \% \end{array} $$

Which has the longer wavelength: red light or green light?

Which has the shorter wavelength: blue light or violet light?