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Periodic Table - Observations

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Explain the following observations.

a) In2O is more basic than In2O3

b) Pi bonds exist between two nitrogen atoms but not between two phosphorus atoms

c) Lithium salts are more readily soluble in polar organic solvents (ethanol, acetone) than in water

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Solution Preview

a) This is equivalent to compare InOH and In(OH)3. In+ has less attraction toward OH- than In3+ because it has less positive charge and it's larger. So InOH more readily ionizes and is ...

Solution Summary

The solution is given as succinct explanations. The periodic table observations are given.

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Candy Experiment - Valence Electrons

Lab Experiment: Interactive Valence Shell Electrons
1. You will need a bag of colored candies such as "Skittles" or "M&M" You should have at least 80 pieces of this candy. You will also need eighteen index cards. Nine sheets of notebook paper torn in half will work as well as index cards.
2. Separate the candies by color. Place the candies on a paper towel to keep them clean.
3. Although there is no physical difference in electrons, try and use the same color for valence shell electrons in the same family.
4. Look at the periodic table in where the element with atomic number 1 is located.
5. Write the chemical symbol for element number 1 on an index card. Draw a circle around the symbol and number to represent the first energy level. Place the appropriate number and color of candies to represent ONLY THE VALENCE SHELL ELECTRONS.
6. Repeat steps 4 and 5 for element with atomic number 2 and show only the valence shell electrons.
7. Repeat steps 4 and 5 for all the elements up to atomic number 18.
8. Arrange your 18 atoms the way they are in the periodic table. Thus the first column should contain the elements hydrogen, lithium, and sodium.

Observations and Skills Development

A. What is the pattern of valences from left to right across a period?
B. What is the pattern of valences from the top of one column to the bottom of the same column?
C. Each column of the periodic table is called a family. Elements in the same family have similar properties. Are there any similarities in the electronic configuration within a family (column)?
D. Which column of elements would you expect to be the most reactive? Explain.

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