7. Which of the following statements about the isotope Y is/are correct?(1) Y has 5 outermost shell electrons.(2) i5Y has 15 neutrons.(3) Y is in Group V in the Periodic Table.(1) only(2) onlyА.В.(1) and (3) only(2) and (3) onlyС.D.8. An unknown element has 2 outermost shell electrons. Which of the following statements concerning this elementare INCORRECT?(1) It must conduct electricity.(2) It must be a metal.(3) It has at least 2 protons.(1) and (2) only(1) and (3) only(2) and (3) onlyА.В.С.D. (1), (2) and (3)9. The relative atomic masses of elements are seldom whole numbers becauseА.atoms of some elements have different atomic numbers.В.atoms of some elements have different masses.С.atoms of some elements have different numbers of electrons.D.atoms of some elements can form ions.10. Which of the following statements is correct?А.All elements must contain protons, neutrons and electrons.В.Atoms of the same element must contain the same number of neutrons.С.Protons and electrons have the same mass.D.None of the above is correct.11. Which of the following groups of elements are all non-metals?А.C, N, P, SBe, Mg, Al, LiB, Si, Ne, ArВ.С.D.О, F, CІ, Be12. Which of the following combinations is INCORRECT?ElementDescriptionА.Beryllium2 outermost shell electronsBerylliumОхygenОхуgenВ.2 occupied electron shellsС.2 outermost shell electronsD.2 occupied electron shells13. Which of the following statements concerning carbon are correct?(1) It has an electronic arrangement of 2,4.(2) It has a relative atomic mass of exactly 12.(3) It has 6 electrons.(1) and (2) only(1) and (3) only(2) and (3) onlyD. (1), (2) and (3)А.В.С.

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Science

Chemistry

31 15

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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