Q9 in the Model, the mass number is shown as the left-hand superscript next to t

Question

Q9 in the Model, the mass number is shown as the left-hand superscript next to the atomic symbol. Provide an explanation of how to determine the mass number from the structure of an atom (its subatomic particles In this case, explain how the number 2 is determined for 2H isotope based on its subatomic particles. Does that work for all the other isotopes as welli? mass number 2 Q10 An atomic mass unit (amu) is the unit of mass used for small particles like atoms and ions. The average atomic masses are given in the Model for various atoms and ions below the element symbol (e.g., hydrogen's average atomic mass is 1.0079 amu). It's an average mass because it takes into account all the isotopes of hydrogen and their relative amounts in nature 1.0079 a) Use the 'H and 2H and 'H (first row) in the model to determine the approximate mass of each individual subatomic particle. (average) atomic mass amu A neutron weighs about An electron weighs about A proton weighs about amu amu b) Is most of the mass of the atom inside or outside of the nucleus? Explain. Tuaid the nucleus The atom mde fom a centol nutas ath

Explanation / Answer

Answer to Q9

2H is the isotope of hydrogen called deuterium with 1 proton , 1 neutron and 1 electron as the sub-atomic particles.

Mass number=number of protons+number of neutrons [As electronic weight is negligibly small so the overall mass of an atom is concentrated in the nucleus consisting of protons and neutrons.

Thus, mass number of deuterium ,2H =1p+1n=2 (written as left hand superscript)

For the other two isotopes of hydrogen:

Protium (1proton and 1 electron and no neutrons) ,mass number=1p +0n=1 (1H)

tritium (1proton,2 neutrons and 1 electron ) ,mass number=1p +2n=3 (3H)

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