Locate each of the following elements in the periodic table;give its name and atomic number, and indicate whether it isa metal, metalloid, or nonmetal: (a) Li, (b) Sc, (c) Ge, (d) Yb,(e) Mn, (f) Sb, (g) Xe.
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Locate each of the following elements in the periodic table;
give its name and
a metal, metalloid, or nonmetal: (a) Li, (b) Sc, (c) Ge, (d) Yb,
(e) Mn, (f) Sb, (g) Xe.
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- For each of the following elements, write its chemical symbol,locate it in the periodic table, give its atomic number,and indicate whether it is a metal, metalloid, or nonmetal:(a) chromium, (b) helium, (c) phosphorus, (d) zinc, (e) magnesium,(f) bromine, (g) arsenic.The element oxygen has three naturally occurring isotopes, with 8,9, and 10 neutrons in the nucleus, respectively. (a) write the full chemical symbols for these three isotopes. (b) Describe the similarities and differences between the three kinds of atoms of oxygen.Suppose that mercury forms a perfect spherical droplet with a diameter of 5.0 mm. (a) What is the volume of the mercury droplet in cubic centimeters (cm3)? (b) If the density of mercury is 13.6 g/cm3, calculate the mass of the droplet. (c) How many mercury atoms are present in the droplet? (Volume of sphere = (4/3)3.14r3)
- 3. (a) Magnesium oxide was formed when the metal burns in air. (i) If 1.25 g of magnesium oxide contains 0.754 g of magnesium, determine the mass ratio of magnesium magnesium oxide. (ii) Calculate the weight of magnesium in 534 g of magnesium oxide.The number of protons, neutrons, and electrons, respectively, in the ionic species 209 9Bi* :3+ 83 are: (A) 83, 126, 80; (B) 83, 209, 80; (C) 86, 209, 83; (D) 83, 126, 86;For each of the following elements, write its chemical symbol, locate it in the periodic table, and indicate whether it is a metal, metalloid, or nonmetal: (a) silver; (b) helium; (c) phosphorus; (d) cadmium; (e) calcium; (f) bromine; (g) arsenic.
- 7. Isotopes. (a) Argon has three naturally occurring isotopes, 36Ar, 38Ar, and 40Ar. What is the mass number of each? How many protons, neutrons, and electrons are present in each? (b) Gallium has two naturally occurring isotopes, 6°Ga (isotopic mass = 68.9256 amu, abundance 60.11%) and 71Ga (isotopic mass = 70.9247 amu, abundance = 39.89%). Calculate the atomic mas of gallium.a %3D (c) Chlorine has two naturally occurring isotopes, 35CI (isotopic mass = 34.9689 amu) and 3"Cl (isotopic mass = 36.9659 amu). If chlorine has an atomic mass of 35.4527 amu, what is the percent abundance of each isotope?For each of the following elements, write its chemical symbol,determine the name of the group to which it belongs (Table 2.3),and indicate whether it is a metal, metalloid, or nonmetal:(a) potassium, (b) iodine, (c) magnesium, (d) argon, (e) sulfur.Identify each of the following elements as a metal, nonmetal,or metalloid: (a) gallium, (b) molybdenum, (c) tellurium,(d) arsenic, (e) xenon, (f) ruthenium.
- (a) Atoms are very small compared to objects on the macroscopic scale. The radius of a vanadium atom is 131 pm. What is this value in meters and in centimeters? cm (b) The mass of a single vanadium atom is 8.46×10-23 g. Suppose enough V atoms were lined up like beads on a string to span a distance of 44.7 cm ( 18 atoms inches). How many atoms would be required? What mass in grams of V would be used? Could you weigh out this amount of vanadium using a typical laboratory balance? (c) Taking the density of vanadium metal to be 6.08 g/cm³, calculate the mass of metal needed to form a piece of V wire with the same length as the distance in b, but with a diameter of 1.00 mm. Hint: The volume of a cylinder is T times its radius squared times its height. (V = T r² h) How many vanadium atoms does this represent? atoms(a) In the certain hydrated salt MSO34H2O, the mass percentage of H2O is 44.71%.Identify the element M in the salt?(b) A certain element has two naturally occurring isotopes.The mass of one of the isotopes is 106.905 amu and its natural abundance is 51.60%.The mass of the second isotope is 108.883 amu.Calculate the average atomic massWrite the chemical symbols of the isotopes(c) An organic compound consists of carbon, hydrogen and sulfur only.The percentage of carbon by mass in this compound was found to be 30.27%.The complete combustion of 1.367 g this compound produces 1.765 g of sulfur dioxide(SO2) (i) Determine the empirical formula for this compound.(ii) If a sample of this compound having the mass 3.781 × 103 mg contains 9.528 × 10–3 molesof the compound, determine the molecular formulaTwo experiments were conducted: 1.2.750 g of copper(II) oxide, CuO2, was reduced by heating at high pressure with excess hydrogen to yield 2.196 g of copper Cu. 2. 1.179 g of copper Cu was dissolved in nitric acid to yield copper(II) nitrate, which was converted to 1.476 g copper(II) oxide, CuO2, on ignition. Show that the results illustrate the law of definite proportions by calculating the percentage of oxygen in copper(II) oxide in experiments 1 and 2. Express your answers numerically to two decimal places, separated by commas. Do not enter the percent symbol. ▾ View Available Hint(s) Percentage of oxygen in sample 1, sample 2 = copper oxide in the sample 15. ΑΣΦ the second experiment S ?