thenuclearatom

thenuclearatom - ChemActivity 1 The Nuclear Atom (What Is...

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Unformatted text preview: ChemActivity 1 The Nuclear Atom (What Is an Atom?) Model: Schematic Diagrams for Various Atoms. o electron (—) —24 o proton (+) 1 amu = 1.6606 X 10 g neutron (no charge) Hydrogen Hydrogen Hydrogen ion Carbon Carbon . 6 protons 7 neutrons 13.0039 amu 6 protons 6 protons 6 neutrons 7 neutrons exactly 12 amu 13.0034 amu 11 protons 12 neutrons o . 8 protons 8 neutrons 15.9960 amu 22.9893 amu 1H and 2H are isotopes of hydrogen. 12C and 13C are isotopes of carbon. The nucleus of an atom contains the protons and the neutrons. 2 ChemActivity1 The Nuclear Atom Critical Thinking Questions 1. How many protons are found in 12C? 13C? 13C"? 2. How many neutrons are found in 12C? 13C? 13C‘? 3. How many electrons are found in 12C? 13C? 13C"? 4. a) What feature distinguishes a neutral atom from an ion? b) How is the charge on an ion determined? 5. Based on the model, a) what do all carbon atoms (and ions) have in common? b) what do all hydrogen atoms (and ions) have in common? c) How many protons, neutrons, and electrons are there in one atom of 1H+? 6. What is the significance of the atomic number, Z, above each atomic symbol in the periodic table? 7. Bascd on your answer to CTQ 6, what do all nickel (Ni) atoms have in common? ChemActivity 1 The Nuclear Atom 3 8. What structural feature is different in isotopes of a particular element? 9. How is the mass number, A, (left-hand superscript next to the atomic symbol as shown in the Model) determined (from the structure of the atom)? 10. Where is most of the mass of an atom, within the nucleus or outside of the nucleus? Explain your reasoning. Exercises 1. Complete the following table. Isotope Atomic Mass Number of Number Number Electrons Z A 3113 15 180 8 19 39 18 5 8N12+ 5 8 2. What is the mass (in grams) of a) one 1H atom? b) one 12C atom? 3. What is the mass (in grams) of 4.35 x 106 atoms of 12C? 4. What is the mass (in grams) of 6.022 x 1023 atoms of 12C? 5. What is the mass (in grams) of one molecule of carbon dioxide which has one 12C atom and two 160 atoms, 120602? 6. a) Define mass number. b) Define atomic number. 4 ChemActivity 1 The Nuclear Atom 7. Indicate whether the following statement is true or false and explain your reasoning. An 180 atom contains the same number of protons, neutrons, and electrons. 8. How many electrons, protons and neutrons are found in each of the following? 24Mg 23Na+ 35C] 35(3— 56Fe3+ 15N 1602— 27A13+ 9. Complete the following table. Isotope Atomic Mass Number of Number Number Electrons Z A 27 59 25 MN 3 7 3 3 6 3 582n2+ 19F— 10. Using grammatically correct English sentences, describe what the isotopes of an element have in common and how are they different. Problems 1. Estimate the mass of one 14C atom (in amu) as precisely as you can (from the data in the model), Explain your reasoning. 2. Use the data in Model 1 to estimate the values (in amu) of a) the mass of an electron, b) the mass of a proton, and c) the mass of a neutron. ...
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thenuclearatom - ChemActivity 1 The Nuclear Atom (What Is...

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