31:22Periodic Table of Elements Explained - Metals, Nonmetals, Valence Electrons, ChargesThe Organic Chemistry Tutor449views2rank
03:40How The Periodic Table Organizes the Elements | Chemistry BasicsAmerican Chemical Society399views
08:34The Periodic Table EXPLAINED | Chemical Families and Periodic TrendsThe Science Classroom1006views
Textbook QuestionFour of the boxes in the following periodic table are colored. Which of these are metals and which are nonmetals?364views
Textbook QuestionExamine Figure 2.3, The periodic table. (f) Classify the following three elements as metals, nonmet-als, or semimetals: Mo, Br, Si.379views
Textbook QuestionDiscussing this chapter, a classmate says, 'Since elements that form cations are metals and elements that form anions are nonmetals, elements that do not form ions are metalloids.' Do you agree or disagree?686views1comments
Textbook QuestionWhere in the periodic table are the metallic elements found? Where are the nonmetallic elements found?740views
Textbook QuestionClassify the following elements as metals, nonmetals, or semimetals: (a) Ti (b) Te (c) Se (d) Sc (e) Si690views
Textbook QuestionClassify the following elements as metals, nonmetals, or semimetals: (a) Ar (b) Sb (c) Mo (d) Cl (e) N (f) Mg653views
Textbook QuestionWrite the symbol for each element and classify it as a metal, nonmetal, or metalloid. a. gold b. fluorine c. sodium d. tin e. argon1061views
Textbook QuestionAt room temperature, a certain element is found to be a soft, silver-colored solid that reacts violently with water and is a good conductor of electricity. Is the element likely to be a metal, a nonmetal, or a semimetal?887views
Textbook QuestionAt room temperature, a certain element is found to be a shiny, silver-colored solid that is a poor conductor of electricity. When a sample of the element is hit with a hammer, it shatters. Is the element likely to be a metal, a nonmetal, or a semimetal?797views
Textbook QuestionAt room temperature, a certain element is yellow crystalline solid. It does not conduct electricity and when hit with a hammer, it shatters. Is the element likely to be a metal, a nonmetal, or a semimetal?474views
Textbook QuestionAt room temperature, a certain element is a colorless, unre-active gas. Is the element likely to be a metal, a nonmetal, or a semimetal?954views
Textbook QuestionLittle is known about the properties of astatine, At, because of its rarity and high radioactivity. Nevertheless, it is possible for us to make many predictions about its properties. (a) Do you expect the element to be a gas, liquid, or solid at room temperature? Explain.978views
Textbook QuestionElement X reacts with element Y to give a product containing X3+ ions and Y2-ions. (b) Is element Y likely to be a metal or a nonmetal? Explain.734views
Textbook QuestionElement X reacts with element Y to give a product containing X3+ ions and Y2-ions. (a) Is element X likely to be a metal or a nonmetal? Explain.363views
Textbook QuestionA historian discovers a nineteenth-century notebook in which some observations, dated 1822, were recorded on a substance thought to be a new element. Here are some of the data recorded in the notebook: 'Ductile, silver-white, metallic looking. Softer than lead. Unaffected by water. Stable in air. Melting point: 153 °C. Density: 7.3 g>cm3. Electrical conductivity: 20% that of copper. Hardness: About 1% as hard as iron. When 4.20 g of the unknown is heated in an excess of oxygen, 5.08 g of a white solid is formed. The solid could be sublimed by heating to over 800 °C.' (a) Using information in the text and the CRC Handbook of Chemistry and Physics, and making allowances for possible variations in numbers from current values, identify the element reported.458views
Open QuestionFor metalloids on the periodic table, how do the group number and the period number relate?177views
Open QuestionWhich of these properties is the best one to use for the identification of an element?158views
Open QuestionWhich groups of the modern periodic table contain elements that are classified as metalloids?132views
Open QuestionWhich are elements that have the physical and chemical properties of both metals and nonmetals?130views