Question: Q: What organizational tool, arguably the best in all of science, lists all the known chemical elements, arranged by atomic number?   Read this paragraph and choose the correct option from the provided answers:  Appendix: Periodic Table of the Elements In this chapter, we present some data on the chemical elements. The periodic table, introduced in Chapter 3 "Atoms, Molecules, and Ions", lists all the known chemical elements, arranged by atomic number (that is, the number of protons in the nucleus). The periodic table is arguably the best tool in all of science; no other branch of science can summarize its fundamental constituents in such a concise and useful way. Many of the physical and chemical properties of the elements are either known or understood based on their positions on the periodic table. Periodic tables are available with a variety of chemical and physical properties listed in each element’s box. What follows here is a more complex version of the periodic table than what was presented inChapter 3 "Atoms, Molecules, and Ions". The Internet is a great place to find periodic tables that contain additional information. One item on most periodic tables is the atomic mass of each element. For many applications, only one or two decimal places are necessary for the atomic mass. However, some applications (especially nuclear chemistry; see Chapter 15 "Nuclear Chemistry") require more decimal places. The atomic masses in Table 17.1 "The Basics of the Elements of the Periodic Table" represent the number of decimal places recognized by the International Union of Pure and Applied Chemistry, the worldwide body that develops standards for chemistry. The atomic masses of some elements are known very precisely, to a large number of decimal places. The atomic masses of other elements, especially radioactive elements, are not known as precisely. Some elements, such as lithium, can have varying atomic masses depending on how their isotopes are isolated. The web offers many interactive periodic table resources. For example, seehttp://www. ptable.   Choices:  - tide table  - logic table  - spreadsheet  - periodic table   A:
periodic table
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Q: What are indestructible and constantly in motion?   Read this paragraph and choose the correct option from the provided answers:  Atoms are indestructible and constantly in motion.   Choices:  - viruses  - crystals  - ions  - atoms   A:
atoms
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Q: What happens to the mass number during a nuclear decay process by positron emission?   Read this paragraph and choose the correct option from the provided answers:  During a nuclear decay process that occurs by positron emission, a proton is converted into a neutron and a positron. The neutron remains in the nucleus, and the positron is expelled. Overall, the atomic number of the parent nucleus increases by one, and the mass number is unchanged. For example, carbon-11 emits a positron to become boron-11:.   Choices:  - it rises  - it decreases  - it increases  - remains unchanged   A:
remains unchanged
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Q: What is the term for the dark brown or black coating found on exposed desert rocks, which is formed of iron and manganese oxides?   Read this paragraph and choose the correct option from the provided answers:  Exposed rocks in desert areas often develop a dark brown or black coating called desert varnish ( Figure below ). Wind transports clay-sized particles that chemically react with other substances at high temperatures. The coating is formed of iron and manganese oxides.   Choices:  - desert patina  - desert shadow  - desert rust  - desert varnish   A:

Answer: desert varnish
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