Question
Use the following model to answer question S and 6 dot (P): 5. How many lone pairs are found in the model above? C. 2 A. 1 D. 0 B. 3 6. How many bonding electrons are found in the model above? C. 2 A. 1 B. 3 D. 0 7. How many neutrons does Copper-65 contain? C. 65 A. 29 B. 36 D. 92 8. How many neutrons does Barium-139 contain? A. 56 C. 83 B. 137 D. 193 9. How many electrons does strontium contain? A. 56 C. 38 B. 84 D. 193 10. How many valence electrons does neon have? A. 2 C. 6 B. 4 C. 8 11. Which of the following elements have 7 valence electrons? A. Mn C. F B. N D. Ag 12. How many valence electrons are in an atom of sulfur? A. 2 C. 6 B. 16 D. 5 13. How many valence electrons are in an atom of phosphorus? A. 2 C. 4 B. 3 D. 5 4. Which subatomic particle plays the greatest part in determining the properties of an element A. proton C. neutron B. electron D. nucleus Determine the number of neutrons in {}^16O A. 4 C. 16 B. 8 D. 24
Solution
4.6
(175 Votos)
Suzana
Mestre · Tutor por 5 anos
Resposta
5. The correct answer is C. 2. In the given model, there are two lone pairs of electrons.6. The correct answer is B. 3. In the given model, there are three bonding electrons.7. The correct answer is B. 36. Copper-65 has an atomic number of 29, which means it has 29 protons. The number of neutrons is calculated by subtracting the atomic number from the mass number: 65 - 29 = 36.8. The correct answer is C. 83. Barium-139 has an atomic number of 56, which means it has 56 protons. The number of neutrons is calculated by subtracting the atomic number from the mass number: 139 - 56 = 83.9. The correct answer is C. 38. Strontium has an atomic number of 38, which means it has 38 protons. In a neutral atom, the number of protons is equal to the number of electrons, so strontium has 38 electrons.10. The correct answer is D. 8. Neon has an atomic number of 10, which means it has 10 protons. In a neutral atom, the number of protons is equal to the number of electrons, so neon has 10 electrons. The first two electrons fill the 1s and the remaining eight electrons fill the 2s and 2p orbitals, making a total of 8 valence electrons.11. The correct answer is C. F. Fluorine has an atomic number of 9, which means it has 9 protons. In a neutral atom, the number of protons is equal to the number of electrons, so fluorine has 9 electrons. The first two electrons fill the 1s orbital, and the remaining seven electrons fill the 2s and 2p orbitals, making a total of 7 valence electrons.12. The correct answer is C. 6. Sulfur has an atomic number of 16, which means it has 16 protons. In a neutral atom, the number of protons is equal to the number of electrons, so sulfur has 16 electrons. The first two electrons fill the 1s orbital, and the remaining 14 electrons fill the 2s, 2p, 3s, and 3p orbitals, making a total of 6 valence electrons.13. The correct answer is D. 5. Phosphorus has an atomic number of 15, which means it has 15 protons. In a neutral atom, the number of protons is equal to the number of electrons, so phosphorus has 15 electrons. The first two electrons fill the 1s orbital, and the remaining 13 electrons fill the 2s, 2p, 3s, and 3p orbitals, making a total of 5 valence electrons.14. The correct answer is A. proton. The properties of an element are determined by the number of protons in its nucleus, which is called the atomic number. The number of protons determines the element's identity and its chemical properties.15. The correct answer is A. 4. The number of neutrons in an atom is calculated by subtracting the atomic number from the mass number. In this case, the mass number is 16 and the atomic number is 8 (since oxygen has 8 protons), so the number of neutrons is 16 - 8 = 8.