Laboratory Experiments For Chemistry: The Central Science, Si Edition
14th Edition
ISBN: 9781292221335
Author: Theodore E. Brown
Publisher: PEARSON
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Chapter 2.3, Problem 2.2.1PE
Practice Exercise 1
Which of these atoms has the largest number of neutrons'?
- 148Eu
- 157Dy
- 149Nd
- 162Ho
- 159Gd
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Topic: Gen Chem
The three naturally occurring isotopes of magnesium are 24-Mg (23.985042, 78.99%), 25-Mg (24.985837, 10.00%), and 26-Mg. What is the atomic mass of 26-Mg?
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- Problem 2-2 What is the mass number of an atom containing: (a) 15 protons, 15 electrons, and 16 neutrons? (b) 86 protons, 86 electrons, and 136 neutrons?arrow_forwardLike Dalton, chemists continue to model atoms using spheres. Modern models are usually drawn with a computer and use different colors to represent atoms of different elements. Which of the models below represents CO2?arrow_forwardBoron, lithium, nitrogen, and neon each have two stable isotopes. In which of the following pairs of isotopes is the heavier isotope more abundant? Check all that apply. 20Ne or 22Ne (average mass, 20.18 u) 10B or 11B (average mass, 10.81 u) 6Li or 7Li (average mass, 6.941 u) 14N or 15N (average mass, 14.01 u)arrow_forward
- Fill in the missing information for each of the following 3 neutral isotopes: PS: I only small summary of explanation and rest is answer.arrow_forwardWeighted average calculation. enter your answer to 2 decimal points. If Chlorine had only two stable isotopes: Cl-35 with a natural abundance of 70.50% and Cl-37 with a natural abundance 29.50%. The average atomic weight of Chlorine = amu.arrow_forwardExercise 4.5 Give the symbol and atomic number for each of the following elements. Also indicate whether each element is a metal or a nonmetal and whether it is a member of a named family. a. argon b. chlorine c. barium d. cesiumarrow_forward
- By referring to the periodic table (Figure 2.15 or inside front cover), identify the group and period to which each of the following elements belongs. Then decide whether the element is a metal, nonmetal, or metalloid. a Se b Cs c Fe d Cu e Brarrow_forwardSelect the mass law(s) demonstrated by the following experimental results. Experiment 1: A student heats 1.27 g of copper and 3.50 g of iodine to produce 3.81 g of a white compound; 0.96 g of iodine remains. Experiment 2: A second student heats 2.55 g of copper and 3.50 g of iodine to form 5.25 g of a white compound; 0.80 g of copper remains.arrow_forwardUnknown element branium has two isotopes. the first isotope (A) has a mass of 56.971 amu and the second isotope (B) has amass of 83.339 amu. The average mass of branium has been determined to be 63.941 amu. What is the percent abundance of the first isotope (A)arrow_forward
- Answered 3: which best represents the isotope?arrow_forwardExercise 4.3 Give the number of protons, neutrons, and electrons in the atom symbolized by80201Hgarrow_forwardNaturally occurring bromine is a mixture of 50.69% Br-79 with an amu = 78.92 and 49.31% Br-81 with a mass of 80.92 amu. What is the atomic weight of bromine? Show work. (5 points)arrow_forward
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