The electrical charge of the hydrogen atom is thought to be exactly zero. This is a consequence of the apparent equality of the magnitude of the electrical charges of the electron and the proton, and their opposite sign.
Necklace definition, a piece of jewelry consisting of a string of stones, beads, jewels, or the like, or a chain of gold, silver, or other metal, for wearing around the neck. See more. Dictionary.com
The theme of the short story, The Necklace is to be happy with who you are and what you have. Madame Loisel lived in the middle class society but longed to be a member of high society. She wanted to live above her means and would do whatever it took to get there.