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Chemistry Ch. 11
| Question | Answer |
|---|---|
| What did Democritus, Dalton, Thomson,Rutherford, and Bohr all have in common? | They each contributed to the development of the atomic theory. |
| In Thomson's plum-pudding model of the atom, the plums represent what? | Electrons |
| An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of? | 197 |
| Which of the following has the least mass? | Electron |
| If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have? | 95 |
| How did Democritus describe atoms? | A single material with one shape and size. |
| What is the smallest particle into which an element can be divided and still be the same substance? | Atom |
| Particle that cannot be cut | Atom |
| Negatively charged particle discovered by Thomson | Electron |
| Central region of the atom | Nucleus |
| Region where electrons are likely to be found | Electron cloud |
| Particle in the center of an atom that has no charge | Neutron |
| Subatomic particle that has a positive charge | Proton |
| A unit of mass that describes the mass of an atom or molecule | Atomic Mass Unit |
| Atom that has the same number of protons but different number of neutrons | Isotope |
| The sum of protons and neutrons in an atom | Mass number |
| How was Bohr's theory of atomic structure similar to and different from the current theory? | Bohr said there was no certain path for electrons, and in the current theory, the exact path cannot be predicted. But there is an electron cloud. |
| Describe atomic number and the atomic mass and explain the difference. | Atomic number tells how many protons are in the nucleus of an atom, while atomic mass tells the mass of an atom or molecule. |
| What was one of Dalton's ideas? | All substances are made of atoms |
| What is the meaning of atom? | Not able to be divided |
| Which statement about isotopes is true? | They have the same number of protons |
| According to Rutherford, what was in the center of an atom? | Nucleus |
| Which phrase describes radioactive isotopes? | They are unstable |
| Which of the following has the least mass in an atom? | Electron |
| Thomson discovered the negatively charged particles called | Electrons |
| Rutherford believed that each atom has a | Nucleus |
| The current atomic theory includes the _ model. | Electron cloud |
| All substances are made of | Atoms |
| Isotopes always have the same number of | Protons |
| Most elements have a mixture of two or more | |
| Protons stay together in the nucleus because of _ force. | Strong |
| Objects are pulled toward one another by _ force. | gravitational |
| Electrons around the nucleus are held in place by _ force. | electromagnetic |
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itslizzie143
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