Unit 2 ( Isotopes Problem Set 2-2 1. Which of the following are isotopes of element X, with atomic number of 9: [pic],[pic],[pic], and [pic]. 2. For each of the following isotopes, write the nuclear symbols: a. Cu-63, Cu – 65 b. C-12, C-14 c. Mg-24, Mg-25, Mg-26 d. Ne-20, Ne-21, Ne-22 3. Verify that the atomic mass of magnesium is 24.31 amu, given the following information: [pic], mass = 23.985042 amu; percent abundance = 78.99% [pic], mass = 24.985837 amu; percent abundance = 10.00% [pic], mass = 25.982593 amu; percent abundance = 11.01% 4.
HSC Chemistry Assessment task 1 Nuclear Chemistry Research report 1. Distinguish between stable and radioactive isotopes and describe the conditions which a nucleus is unstable. To understand if an element is stable we first must understand what stability is. The stability of the nucleus is directly related to the strength of the forces that hold the nuclear particles together. These protons and neutrons of the nucleus are called nucleons.
(1 point for each molecule) The central atom is C. 2. How many atoms are bonded to the central atom? (1 point for each molecule) There are two atoms bonded to the central atom. 3. How many lone pairs of electrons are on the central atom?
Which one of the following molecules has tetrahedral geometry? A. CF4 B. XeF4 C. BF3 D. NH3 E. AsF5 63. A molecule with 3 single bonds and 0 lone pairs of electrons is predicted to have which type of molecular geometry? A. Trigonal planar B. Trigonal pyramidal C. Bent D. Trigonal bipyramidal E. Linear 64. A central atom with 4 electron pairs (single bonds and/or lone pairs of electrons) could have which of the following molecular geometries?
b. Is the particle neutral, positively charged or negatively charged? An aqueous solution, neutral S 2- c. What is the formula of the particle? Justify your answer. 8) When the uncharged atoms of potassium loose an electron, they then
OCR B CHEMISTRY F331 (Unit 1) Revision Guide 2014 Formulae, equations and amount of substance | Key Terms (a). * Atomic Number: Atomic number is the number of protons in the nucleus. * Mass Number: Mass number is defined as the sum of the numbers of protons and neutrons in the atom’s nucleus. * Isotopes: Atoms with the same number of protons but different number of neutrons are called isotopes; they therefore have different masses. * Avogadro’s constant: The number of toms per mole is called the Avogadro’s constant.
The atomic masses of two isotopes of cobalt are 59 and 60. a) What is the number of protons and neutrons in each? • The protons are the same otherwise it wouldn't be cobalt = 27 So the remainders are neutrons = 32 or 33 b) What is the number of orbiting electrons in each when the isotopes are electrically neutral? • Electrons = protons = 27, if electrically
Isotopes Lab By: Darlene Cortez (1st Pd) Background: Atoms of the same element that have different masses are known as isotopes. The difference in mass between isotopes is the result of these atoms having different numbers of neutrons. Key vocabulary: Relative abundance- Relative abundance is a component of biodiversity and refers to how common or rare a species is relative to other species in a defined location or community. Weighted average - An average that takes into account the proportional relevance of each component, rather than treating each component equally. Average Atomic Mass- The mass calculated by summing the masses of an elements isotopes, each multiplied by its natural abundance on earth Mass Number- The total
Name___________________________ Period_________________ Chemical Bonds Review Sheet Part one Write the definitions for each of the following terms. Octet rule Cation Anion Ionic compound Monatomic ion Covalent bond Molecular compound Nonpolar covalent bond Polar covalent bond Single bond Double bond Triple bond Part 2 1. Which has a greater potential energy, a noble gas or a metal? Explain your answer. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ 2.
a.|protons| b.|electrons| c.|neutrons| d.|nuclei| ____ 3. How do vapors and gases differ? a.|Generally,