University:
Harvard University
Course:
CHEM 40 | Inorganic Chemistry
Academic year:

2024
Views:

95

Pages:

1
Author:

Blake Lutz

The Atom and the Periodic Table Worksheet 1. 2. When a gas is heated, the gas will emit light. Explain why this phenomenon occurs using the Bohr model of the atom. List the number of protons, electrons, and valence electrons for each of the following a) Mg b) Al c) [Al]3+ d) I e) [S]2- 3. Write the chemical name and symbol corresponding to each of the following descriptions: a) 11 protons and 10 electrons b) 18 electrons and a net charge of 3c) 16 protons and 18 electrons 4. Determine the number of protons, electrons and neutrons present in an atom of each of the following isotopes: a) calcium-42 b) strontium-90 c) cesium-137 d) iron-59 e) sodium-24 5. Describe what happens to the radius of an atom as it a) gains an electron b) loses an electron 6. Which element in the periodic table would you expect to be a) the most reactive metal? Give your reasons. b) the most reactive nonmetal? Give your reasons. 7. S, Al, K, Mg, and Sr are all representative elements. Use your understanding of trends in the periodic table to predict their order of a) increasing ionization energy b) increasing atomic radius c) increasing electron affinity d) increasing electronegativity 8. When a chlorine atom forms an ion its radius increases, but when a sodium atom forms an ion its radius decreases. Explain this apparent contradiction. 9. Compare the elements B, C, N, and O. a) Which has the most metallic character? b) Which has the largest atomic radius? c) Place the 4 elements in order of INCREASING ionization energy. d) Place the 4 elements in order of INCREASING electronegativity. 10. Compare the elements Be, Mg, Ca, Sr. a) Which has the most metallic character? b) Which has the largest atomic radius? c) Place the 4 elements in order of INCREASING ionization energy. d) Place the 4 elements in order of INCREASING electronegativity. 11. Place the following in order of increasing atomic radius: O2-, F, F-. 12. Place the following in order of increasing atomic radius: Ne, O2-, N3-, F-