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CHEM B FINAL EXAM
Final Exam Review
| Question | Answer |
|---|---|
| 1. ________________are positively-charged particles found in the ___________ of an atom. | Protons, nucleus |
| 2. _________________are particles that have no charge and are found in the nucleus | Neutrons |
| 3. _________________are negatively-charged particles that orbit the nucleus | Electrons |
| 4. In a neutral atom, protons have the same number of ________________. | electrons |
| 5. Together, the ________________ and _____________ make up the atom’s mass number. | protons, neutrons |
| 6. An atom’s ______________ _____________ is the number of protons. | atomic number |
| 7. Atoms of the same element with different number of neutrons are called ______________ | isotopes |
| 8. ________________ is found by subtracting the atomic number from mass number. | (Number of ) neutrons |
| 9. The particles responsible for the mass of an atom are _____________ and _____________. | protons, neutrons |
| 10. What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons? _________ | 7 |
| What is the most important subatomic particle to examine when determining an elements identity? | protons |
| 12. An atom with 13 protons and 13 neutrons and an atom with 14 protons and 13 neutrons are | different elements |
| 13. What is the number of protons, neutrons and electrons in an isotope of Titanium with a mass of 50? | 22p, 28n, 22e |
| 14. The unnamed element “A” exists as two naturally occurring isotopes. “A”-270 occurs 75% of the time and “A”-272 occurs 25% of the time. Calculate the correct average atomic mass. | |
| 15. Find the average atomic mass given the common isotopes of chlorine. Isotopic Notation Mass (amu) Percent Abundance Chlorine-35 34.97 75.77 Chlorine-37 36.97 24.23 | |
| 16. An isotope has three forms. 30% have a mass of 4 amu, 20% have a mass of 5 amu, and 50% have a mass of 3 amu. The average atomic mass will be closest to __________. | |
| 19. Valence electrons are __________ | outermost electrons |
| 20. The maximum number of valence electrons possible in any outermost shell is _________. | 8 |
| According to the Bohr model of an atom, electrons are like _____________ in the solar system. | planets |
| The maximum number of valence electrons around the element in a Lewis structure is ______. | 8 |
| The octet rule states that most elements want to have _______ valence electrons. | 8 |
| The total number of electrons in the second principal energy level is __________. | 8 |
| What is this element? _____________ = 1s22s22p63s23p64s23d104p6 | |
| What atom matches this electron configuration? _____________ 1s2 2s2 2p6 3s2 | Magnesium |
| 28. What is the type of bond that exist between sodium (Na) and chlorine (Cl)? | Ionic |
| Positive metal ions immersed in a sea of mobile electrons describes a/n | metallic bond |
| If the electronegativity difference between two atoms is 0, the type of chemical bond is __________________ | polar covalent |
| Elements from Groups 15 and 16 in the periodic table could form a _________________ bond. | covalent |
| 32. How many electrons are in Na+? _________ | 10 |
| What elements generally make an ionic bond? ______________ | metal and nonmetal |
| 34. The metals in Groups 1A, 2A, and 3A (gain, lose) electrons when they form ions. | lose |
| How many electrons are in O-2? ________ | 10 |
Created by:
don gt