3445 1- Page 3 15) Compared to an atom of C-12, an atom of C-14 has A) fewer protons CY mone neutrons D) fewer neutrons B) more protons A What is the mass number of an atom which contairs 28 protons, 28 electrons, and 16) 34 heutrons? A) 62 B) 28 C) 56 D) 90 17) A sample of Nitrogen contains 95% AN atoms,3% EN atoms and 2% 16N atoms. What is the average atomic mass of this sample? A) 16 amu B) 13 amu D) 14 amu (9 15 amu 18) If Xis the symbol of an element, which pair correctly represents isotopes of X 158 64 X and 158 158 A) 158 X and 64 64 65 158 D) 159 158 158 B) X and X and 64 64 64 64 19) What is the atomic number of an atom with six valence electrons? D) 6 C) 12 B)) 8 A) 10 A strontium atom differs from a strontium ion in that the atom has a greater 20) C) number of electrons D) number of protons mass number B) atomic number D 21) What is the total number of electrons in a Mg2- ion? 10 C) 2 B) 12 A) 24 Which of the following is the electron-dot symbol for an atom with an electron 22) configuration of 2-5? D) .x. B)

3445 1- Page 3 15) Compared to an atom of C-12, an atom of C-14 has A) fewer protons CY mone neutrons D) fewer neutrons B) more protons A What is the mass number of an atom which contairs 28 protons, 28 electrons, and 16) 34 heutrons? A) 62 B) 28 C) 56 D) 90 17) A sample of Nitrogen contains 95% AN atoms,3% EN atoms and 2% 16N atoms. What is the average atomic mass of this sample? A) 16 amu B) 13 amu D) 14 amu (9 15 amu 18) If Xis the symbol of an element, which pair correctly represents isotopes of X 158 64 X and 158 158 A) 158 X and 64 64 65 158 D) 159 158 158 B) X and X and 64 64 64 64 19) What is the atomic number of an atom with six valence electrons? D) 6 C) 12 B)) 8 A) 10 A strontium atom differs from a strontium ion in that the atom has a greater 20) C) number of electrons D) number of protons mass number B) atomic number D 21) What is the total number of electrons in a Mg2- ion? 10 C) 2 B) 12 A) 24 Which of the following is the electron-dot symbol for an atom with an electron 22) configuration of 2-5? D) .x. B)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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