QUIZ 1. Which ion has lost an electron? a. PO4b. NH4+ c. Cld. OHAnswer: b. Without knowing these ions well yet, you can recognize that losing an electron means losing an electric charge that is negative. This leads to a positively charged ion of NH4+. 2. What defines the atomic number of a specific atom? a. The number of electrons in the atom b. The number of protons and neutrons in the atom c. The number of protons in the atom d. The number of protons and electrons in the atom Answer: c. The atomic number is defined as the number of protons that exist in the atom. 3. What is the mass number of an atom or element? a. The number of electrons in the atom b. The number of protons and neutrons in the atom c. The number of protons in the atom d. The number of protons and electrons in the atom Answer: b. The number of protons and the number of neutrons in an atom is considered the atomic mass or mass number of the atom.
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