(a)
Interpretation:
Thenumber of elements in fourth period of periodic table is to be stated.
Concept Introduction:
The elements are made up of atoms. These atoms consist of protons, neutrons and electrons. The electrons revolve around the nucleus in different orbits. The distribution of the electrons in orbit is known as electronic configuration.
(b)
Interpretation:
The number of elements in group
Concept Introduction:
The elements are made up of atoms. These atoms consist of protons neutrons and electrons. The electrons revolve around the nucleus in different orbits. The distribution of the electrons in orbit is known as electronic configuration.
Trending nowThis is a popular solution!
Chapter 2 Solutions
General, Organic, and Biological Chemistry - 4th edition
- 2.43 g magnesium was completely burnt in oxygen to give magnesium oxide. 2 Mg(s) + O2(g) → 2 MgO(s) (Relative atomic masses: O = 16.0, Mg = 24.3) (a) Draw the electronic diagrams of O2 and MgO, showing electrons in the outermost shell only. (b) (i) How many mole of magnesium was present? (ii) How many mole of oxygen was required to completely react with the amount of magnesium in (i)? (iii) Hence, calculate the amount of oxygen required to completely react with the magnesium. (c) Similarly, calculate the amount of MgO formed.arrow_forwardHelium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe. (a) The radius of a helium atom is 3.1x10-11 m; the radius of its nucleus is 2.5x10-15 m. What fraction of the spherical atomic volume is occupied by the nucleus (V of a sphere 5 4/ 3πr3)? (b) The mass of a helium-4 atom is 6.64648x10-24 g, and each of its two electrons has a mass of 9.10939x10-28 g. What fraction of this atom’s mass is contributed by its nucleus?arrow_forwardThe 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.arrow_forward
- (a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 9.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 10 electrons already present?arrow_forwardConsider the nuclide cobalt-59 (5927Co). (a) The mass of 5927Co in atomic mass units is 58.933200 u. (Note this is the mass of the entire atom, not just the nucleus.) This mass is lower than the total mass of its constituent protons, neutrons, and electrons. Find the difference, in atomic mass units, between the total mass of the constituent particles, and the actual mass of the nuclide. (This is sometimes called the "mass defect.") The mass of a proton is 1.007276 u, the mass of a neutron is 1.008665 u, and the mass of an electron is 5.486 ✕ 10−4 u. (Round your answer to at least four decimal places.) b) Since, according to special relativity theory, mass and energy are "equivalent," the mass defect, or "missing" mass found in part (a), is measurement of the energy it would take to break the bound 5927Co atom into its constituent particles. In other words, it is equivalent to the binding energy. Using the result of part (a), find the binding energy per nucleon, Eb/A for 5927Co in…arrow_forwardLook up the following information for the element iridium: (i) number of protons, neutrons, and electrons; (ii) atomic number and average atomic mass; (iii) the charge of the anion(s) or cation(s) that it commonly forms; (iv) the mass of its two most common isotopes and the number of protons and neutrons in each one. Also, comment briefly on the presence of this element in meteorite craters and the significance of this observation.arrow_forward
- 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.arrow_forward6. A solid circular cone made of pure platinum (d = 21.45 g/cm³) has a diameter of 2.75 cm and a height of %3D 3.00 inches. (a) How many moles of platinum are there in the cone? (b) How many electrons are there in the cone?arrow_forward(a) Which two of the following are isotopes of the same element:3116X, 3115X, 3216X? (b) What is the identity of the elementwhose isotopes you have selected?arrow_forward
- (1) The element gallium (Ga) exists in two isotopic forms with the following abundances: 60.16% 69Ga and 39.84% 71Ga. Calculate the atomic mass of gallium. (The exact iso-topic mass of 69Ga is 68.9257. The exact isotopic mass of 71Ga is 70.9249.) (2) The element carbon (C) exists in two isotopic forms with the following abundances: 98.89% 12C and 1.11% 13C. Calculate the atomic mass of carbon.arrow_forwardThe anticancer drug Platinol (Cisplatin), Pt(NH₃)₂Cl₂,reacts with the cancer cell’s DNA and interferes with its growth.(a) What is the mass % of platinum (Pt) in Platinol? (b) If Pt costs$19/g, how many grams of Platinol can be made for $1.00 million(assume that the cost of Pt determines the cost of the drug)?arrow_forward(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 mass Write the chemical symbols of the isotopesarrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning