1. The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below? 7Li O A 2 neutrons OB. 13 neutrons C. 4 neutrons O D. 7 neutrons 2. The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below? 19F1- O A 8 electrons O B. 9 electrons C. 10 electrons O D. 20 electrons 3. The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below. Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons? CI: A 35C1¹- B. 35C12- C. 35C11+ O D. 35cl

1. The atomic number of lithium is 3. How many neutrons does an atom of lithium have if it is represented by the symbol shown below? 7Li O A 2 neutrons OB. 13 neutrons C. 4 neutrons O D. 7 neutrons 2. The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below? 19F1- O A 8 electrons O B. 9 electrons C. 10 electrons O D. 20 electrons 3. The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below. Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons? CI: A 35C1¹- B. 35C12- C. 35C11+ O D. 35cl

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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1. Fill in the following table (each column represents a different isotope): b. Complete Chemical Symbol Element Name (specific isotope) Atomic Number Mass Number Number of Protons Number of Neutrons Number of Electrons (free atom) Number of Valence Electrons Group Number Group Name (if there is one) Period Metal/nonmetal? a. 55 Cr (skip for 55Cr) 38 50 C. 54 74
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Which of the following statements is/are true about 59C03+? (1) this ion has 27 protons (2) this ion has 32 neutrons (3) this ion has 28 electrons O a. 1 and 3 only O b. 1 and 2 only O c. 2 and 3 only o d. 1 only O e. 3 only
Q.3 A neutral atom has a mass number of 80 and has 45 neutrons. Write its complete symbol. Q.4 An atom has two more protons and two more electrons than the atom in question 3. What is its complete symbol?
3. Which statement accurately describes the atoms of a specific element? A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus. An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus. A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus. An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus. CLEAR ALL
Beryllium has an atomic number of 4. Which of the following statements is true of a neutral Beryllium atom? 1. It has 4 protons, 4 electrons, and 4 neutrons. O 2. It has 4 protons, 4 electrons, and 2 neutrons. O 3. It has 2 protons, 2 electrons, and 0 neutrons. 4. It has 2 protons, 2 electrons, and 2 neutrons.
2. Which of the following best describes an element? a. A neutral substance consisting of a cation and an anion b. A substance consisting of two non-metals C. A substance consisting only of atoms having the same nur of protons. d. A substance that can only be found as a solid e. A substance consisting only of atoms having the same num of neutrons O a O b O c dl
104. Which of the following is(are) correct? a. 40Ca2+ contains 20 protons and 18 electrons. b. Rutherford created the cathode-ray tube and was the founder of the charge-to-mass ratio of an electron. lithi c. An electron is heavier than a proton. cu d. The nucleus contains protons, neutrons, and electrons.
15 If an element has 26 protons and 23 electrons:a. The element forms a cationb. Two of the choicesc. The element forms an aniond. The element won’t exist in reality16 Al has a mass number of 27 and its atomic number is 13. Therefore:a. It has 27 electronsb. It has 14 neutronsc. It has 27 neutronsd. It has 14 electronse. It has 13 neutrons 17 Why is it important to use demineralized water in Gravimetric Analysis?a. Because it has lower density that regular tap waterb. Because it has a higher melting point compared to regular tap waterc. Because it is safer to use d. Because it is devoid of minerals that will interfere with the precipitation reaction