D=mxv so your answer should be 269.37
<span>19.992*0.9048+20.993*0.0027+21.991+0.0925 = </span><span> 20.1797 amu (C)</span>
It has more lines in it compared to hydrogen emission spectrum. It is mainly because the helium atom has more electrons than a hydrogen atom. Therefore, more electrons get excited when we pass a white light beam through a helium sample, and it causes the emission of more spectral lines
Is there a picture of the isotope or?- becaue I can’t help if I don’t have a visual.
the answer you are looking for is 4.22 kj.