1. In the lecture we state that most of an atom's mass is in the nucleus. How many electrons would a negative hydrogen ion need to have the same mass in the electron cloud that it has in the nucleus? Hint: it would be highly charged and certainly not stable! 1 point
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67 \times 10^{-27}\) kg. This is the mass of the nucleus of a hydrogen atom, as it contains only one proton. Show more…
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The following questions pertain to an atom with protons, neutrons, and 2 electrons. Use the subatomic particle symbols determined in question 10 to draw the picture of an atom in a planetary model structure. What is the charge on this atom? (magnitude and sign, like 3+) Hint: the proton cancels out the electron. An atom with an excess of positive or negative charges is called an ion. Almost all of the atomic mass is contained in the nucleus because protons and neutrons are so much heavier than electrons. Atomic masses are measured in atomic mass units (amu). A proton and neutron have a mass of about 1 amu. For now, we can assume that the mass of an electron is almost 0 amu. What is the mass of the ion you drew? Electrons have a negligible mass compared to protons and neutrons. The identity of an atom is determined by the number of protons. This is listed on the periodic table as the atomic number. What is the atomic number of the ion you drew? Use the periodic table to identify the element you drew. Name: Symbol:
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