The periodic table.The periodic table is a systematic way to organize Earth's elements, substances that consist of atoms of only one kind. Today, there are 112 known and named chemical elements, Elements are arranged according to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. their increasing atomic numbers. Hydrogen (H), for example, has an atomic number of 1 and is the lightest known natural element on Earth. Scientists have created elements with atomic numbers greater than 92, but they don't exist naturally. Some scientists think they may have created elements heavier than 112, but until an element is confirmed by two different labs, it usually isn't listed on the periodic table. it's your choice Test your chemistry IQ! Answer the following questions <TI>The periodic table. about elements and the periodic table.</TI> 1. Name that element! -- 2. The elements in groups 3 to 12 are called A transition metals. B noble gases. C alkali metals alkali metals, metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univalent compounds. . D nonmetals. 3. The center of an atom is called its A proton. B neutron. C nucleus. D electron. 4. Which element is a member of the same group as fluorine fluorine (fl  `ərēn, –rĭn), gaseous chemical element; symbol F; at. no. 9; at. wt. 18.998403; m.p. −219.6°C;; b.p. −188.14°C;; density 1. (F)? A Sulfur (S) B Iodine iodine (ī`ədīn, –dĭn) [Gr.,=violet], nonmetallic chemical element; symbol I; at. no. 53; at. wt. 126.9045; m.p. 113.5°C;; b.p. 184.35°C;; sp. gr. 4.93 at 20°C;; valence −1, +1, +3, +5, or +7. (I) C Silicon (Si) D Lithium (Li) 5. Elements that are good at transmitting an electrical charge are called A alloys, B minerals. C conductors. D metals. 6. If silver (Ag) were to lose two protons, it would have the same atomic number as which element? A Oxygen (O) B Arsenic (As) C Mercury (Hg) D Rhodium rhodium (rō`dēəm), metallic chemical element; symbol Rh; at. no. 45; at. wt. 102.9055; m.p. about 1,966°C;; b.p. 3,727±100°C;; sp. gr. 12.41 at 20°C;; valence +2, +3, +4, +5, or +6. (Rh) 7. -- has an average atomic mass atomic mass, the mass of a single atom, usually expressed in atomic mass units that's greater than zinc's (Zn). A Argon argon (är`gŏn) [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2°C;; b.p. −185.7°C;; density 1.784 grams per liter at STP; valence 0. (Ar) B Gold (Au) C Potassium (K) D Carbon (C) A cloud of 29 electrons Orbit the mystery Elements ANSWERS: ITS'S YOUR CHOICE, p 20 1. Cooper (CU) 2. a 3. c 4. b 5. c 6. d 7. b |
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