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Chem Test
atomic mass
| Question | Answer |
|---|---|
| conducted an experiment- flying a kite with a key | Franklin |
| these have a mass of 1 atomic mass unit (AMU) | protons and neutrons |
| the charge and mass number number of a neutron are | charge=0, mass number= 1 |
| the nucleus of most atoms is made up of | protons and neutrons |
| the nucleus of the atom is held together by | nuclear forces |
| what constitutes most of the volume of an atom | shells or orbitals |
| the atomic number of an element is equal to | the number of protons in the atom |
| the mass number of an atom is determined by | adding the neutrons and protons |
| the charge and mass number of an electron are | charge= -1,mass number= 0 |
| which of the following descriptions apply to the nucleus | charges |
| most of the mass of the atom can be found in the | nucleus |
| the charge and mass number of a proton are | charge= 1, mass number= 1 |
| the laws of electrostatics consistently demonstrate that "like" (identical) charges | attract |
| isotopes are atoms of the same element that differ in | the mass number |
| from rutherfords experiment could be deduced | the atom is mostly empty space |
| a proton | none of the above |
| the mass number | is the average mass of the isotopes of that atom |
| an electron | has a mass of almost zero |
| isotopes are | atoms of the same element with a different number of neutrons |
| alpha particles are | the same as a helium-nuclei |
| in bohrs atomic model | the electrons move around the nucleus in a circle or orbits |
| which is not true? | all are false |
| devised the "gold foil experiment" | rutherford |
| plum pudding model. positively charged goo with negative chunks randomly scattered | thompson |
| created the law of conservation of matter | lavosier |
| thompson found that atoms could sometimes eject a far smaller negative particle which he called an | electron |
| rutherford found that they fired a ____ at a piece of gold foil which was only a few atoms thick | helium-nuclei or an alpha particle |
| with electronic configuration elements are represented numerically by the ___ in their shells and numbers of shells | number of electrons |
| which is not true? | atoms of different elements contain different number of electrons |
| isotopes of any particular element contain the same number of ___, but different numbers of ___ | protons and neutrons |
| who suggested that all matter was made up of tiny spheres that were also to bounce around with perfect elasticity | dalton |
| his new evidence allowed him to propose a more detailed model with a central nucleus | rutherford |
| which is not alpha decay | Bismuth-214 to Polonium-214 |
| which one is alpha decay | Polonium-214 to lead-210 |
| radium-224 alpha decay | Rn 220 and He Nucleus |
| radon-219 alpha decay | Po 215 and He Nucleus |
| bismuth-210 beta decay | Po 210 and electron |
| bismuth-214 beta decay | Po 214 and electron |
| Dalton was wrong about the atom because of two reasons | atoms can be split and isotopes |
| which is true | all are true |
Created by:
agustina92797
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