Problem: Determine the topic of the passage. "Each shell can contain only a fixed number of electrons: The 1st shell can hold up to two electrons, the 2nd shell can hold up to eight electrons, the 3rd shell can hold up to 18, and 4th shell can hold up to 32 and so on." Topic:

A: Electron shell


Problem: Determine the topic of the passage. "It describes change in one's work and life, and four typical reactions to said change by two mice and two "littlepeople", during their hunt for cheese ." Topic:

A: Who Moved My Cheese?


Problem: Determine the topic of the passage. "The 2008 Sunday Times Rich List estimated Rowling's fortune at £560 million ($798 million), ranking her as the twelfth richest woman in the United Kingdom." Topic:

A: J. K. Rowling


Problem: Determine the topic of the passage. "Janet Kay Ruthven Hagan (; born May 26, 1953) is the junior United States Senator from North Carolina , in office since January 2009." Topic:

A:
Kay Hagan