2 minute read
Quiz
QUIZ
1. Which ion has lost an electron?
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a. PO4b. NH4+ c. Cld. OH-
Answer: 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.
4. If the atomic number of aluminum is 13 and the mass number is 27. How many neutrons are in the aluminum atom?
a. 12 b. 13 c. 14 d. 27
Answer: c. The mass number is going to be the atomic number plus the neutron number. This means that the number of neutrons is 27 minus 13 or 14.
5. What aspect is the same in different isobars?
a. Atomic number b. Neutron number c. Atomic mass d. Proton number
Answer: c. These substances have atoms that have the same atomic mass because the total number of protons and neutrons together is the same. Their atomic number will be different as they are of different elements.
6. Isobars have the same number of what particles per atom?
a. Protons b. Neutrons c. Electrons d. Nucleons
Answer: d. Remember that nucleons are the sum total of the neutrons and protons; the number of nucleons is the same in atoms that are isobars of each other.
7. What trait of an element is most closely related to the electronegativity of an atom?
a. Ionization energy b. Valency c. Atomic radius d. Electron affinity
Answer: d. The electronegativity is most closely related to the electron affinity because both are related to the willingness of an atom to accept an electron.
8. Which symbol is the symbol for iron on the periodic table?
a. Au b. Fe c. I d. Ag
Answer: b. The chemical symbol for iron is Fe, which explains the name often used to describe iron in a molecule as being “ferrous” or “ferric”.
9. Which is not a nonmetal?
a. Carbon b. Oxygen c. Potassium d. Nitrogen
Answer: c. With the exception of potassium, each of these is a nonmetal and have different properties; potassium is an alkali metal and is not a nonmetal.
10. Which of these is not a noble gas?
a. Argon b. Hydrogen c. Helium d. Xenon
Answer: b. Argon, Helium, and Xenon are noble gases; however, hydrogen is listed as a nonmetal and, instead of being relatively inert, has highly reactive properties.
