Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter4: Chemical Foundations: Elements, Atoms, And Ions
Section: Chapter Questions
Problem 117CP: Which of the following is(are) correct? a.40Ca2+ contains 20 protons and 18 electrons. b. Rutherford...
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Question
choose the correct answer.
36. Which of these represents an ion? *
A. Mg
B. 2^4He
C. Na+
D. Ca-40
37. Which statement about an atom with atomic number 140 is not true? *
A. It contains 140 protons
B. It contains 140 electrons
C. Its atomic weight is 140
D. Its nuclear charge is 140
38. The number of nucleons of an atom is equal to *
A. A
B. AW
C. n
D. Z
39. The following are characteristics of a nuclear change except *
A. it originates from the nucleus
B. It releases tremendous amount of energy
C. It is affected by external conditions such as temperature and pressure
D. It changes the identity of the atom
40. Isotopes contain different numbers of *
A. electrons
B. neutrons
C. atomic number
D. protons
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