CHEMISTRY REVIEW For Atomic Structure Test

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Presentation transcript:

CHEMISTRY REVIEW For Atomic Structure Test

Proton Neutron Electron 1. Subatomic Particle Mass Charge Location Proton 1 + Nucleus Neutron No Charge Electron - Outside Nucleus

2. The atomic number of an element is defined by its number of ( protons / neutrons / electrons ). 3. What is the name for atoms of an element that have different masses or number of neutrons? ISOTOPE 4. What isotope has 8 protons and 10 neutrons? Oxygen-18

5. Identify the following for: atomic number 20 mass number 41 protons 20 electrons (20-2) 18 neutrons (41-20) 21

6. In a neutral atom, what subatomic particles are the SAME 6. In a neutral atom, what subatomic particles are the SAME? Protons = Electrons 7. What is the smallest particle of an element that maintains the properties of the element? Atom 8. A neutral atom of an element contains 12 electrons. What is the identity of this element? Mg 9. What is the name of the element that has an atomic number of 4? Beryllium 10. What do the dots represent in a Lewis Dot Diagram? Valence Electrons 11. Average atomic mass is the ( actual / weighted ) average of all the isotopes of an element.

12. Identify if atom #1 and #2 are the same element or different elements using the information in the table. Atom #1 Atom #2 Same or Different 3 protons, 3 neutrons 3 protons,4 neutrons Same B. 4 protons, 4 neutrons Different C. 3 protons, 4 neutrons D. 4 protons, 3 neutrons

13. Which isotope of Carbon is the most abundant, naturally occurring one? a. Carbon-14 b. Carbon-13 C. Carbon-12 14. What is the atomic mass of silicon if 92.21% of its atoms have a mass of 27.977u, 4.70% have mass 28.976u, and 3.09% have mass 29.974u? .9221 x 27.977 = 25.80 .0470 x 28.976 = 1.36 + .0309 x 29.974 = 0.93 28.1 amu

Abundance (Percentage) ÷ 100 Mass x Percentage Answer 15. Find the average atomic mass of Krypton using the data table below: Isotopic mass Abundance (Percentage) ÷ 100 Mass x Percentage Answer 77.920u x 0.350% = .00350 = 0.27 79.916u x 2.27% = .0227 = 1.81 81.913u x 11.56% = .1156 = 9.47 82.914u x 11.55% = .1155 = 9.58 83.912u x 56.90% = .5690 = 47.75 85.911u x 17.37% = .1737 = 14.92 Answer: 83.80 amu

17. Identify the # of protons 1 , neutrons 2 and electrons 1 for

26. How many valence electrons does each of the following have 26. How many valence electrons does each of the following have? Ga - 3 Li- 1 As - 5 Xe - 8 Mg - 2 O- 6 C - 4 F - 7 27. An atom that has different number of electrons and protons is an ( isotope / atom / ion ).

29. Identify the following for magnesium-27 Protons: 12 Neutrons: (27-12) 15 Electrons: 12 Mass Number: 27 Atomic Number: 12 30. Identify the number of electrons in the following: Cu+1 (29-1) = 28 P-3 (15+3) = 18 F-1 (9+1) = 10 Co+3 (27-3) = 24 Fe+2 (26-2) = 24 Zn+2 (30-2) = 28