Answer:
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Explanation:
ex. xy+xy>xy+xy
- Hope that helped! Let me know if you need a further explanation.
Democritus said that the atom was just a sphere.
Oxygen gas was most likely absent from Earth's primitive atmosphere. The current theory is that the Earth's early atmosphere was composed of mainly carbon dioxide and methane due to the high volcanic activity. Cyanobacteria and their use of photosynthesis was what caused earth's atmosphere to become oxygen enriched.
I hope that helps.
<u>Answer:</u> The average atomic mass of element bromine is 80.4104 amu.
<u>Explanation:</u>
Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
.....(1)
- <u>For _{35}^{79}\textrm{Br}[/tex] isotope:</u>
Mass of
isotope = 78.9183 amu
Percentage abundance of
isotope = 50.69 %
Fractional abundance of
isotope = 0.5069
- <u>For
isotope:</u>
Mass of
isotope = 80.9163 amu
Percentage abundance of
isotope = 49.31 %
Fractional abundance of
isotope = 0.4931
Putting values in equation 1, we get:
![\text{Average atomic mass of Bromine}=[(78.9183\times 0.5069)+(80.9163\times 0.4931)]](https://tex.z-dn.net/?f=%5Ctext%7BAverage%20atomic%20mass%20of%20Bromine%7D%3D%5B%2878.9183%5Ctimes%200.5069%29%2B%2880.9163%5Ctimes%200.4931%29%5D)

Hence, the average atomic mass of element bromine is 80.4104 amu.