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Stack #4569619
| Question | Answer |
|---|---|
| Who discovered the electron? | J.J. Thomson (1897) |
| Year of electron discovery? | 1897 |
| Charge of electron? | –1 |
| Mass of electron in a.m.u.? | 1/1840 a.m.u. |
| Who discovered the proton? | Rutherford (1919) |
| Charge of proton? | +1 |
| Mass of proton? | 1 a.m.u. |
| Who discovered the neutron? | Chadwick (1932) |
| Charge of neutron? | 0 |
| Mass of neutron? | 1 a.m.u. |
| What particles were used in Rutherford’s experiment? | Alpha particles (He²⁺) |
| Target in Rutherford’s experiment? | Thin gold foil |
| What happened to most alpha particles? | Passed straight through |
| Why did most alpha particles pass straight? | Atom is mostly empty space |
| What happened to a few alpha particles? | Bounced back |
| Why did a few alpha particles bounce back? | Hit dense, positively charged nucleus |
| Some alpha particles were | Deflected at angles |
| Conclusion about the nucleus? | Tiny, dense, positively charged |
| Conclusion about the atom? | Mostly empty space with electrons around nucleus |
| Who proposed the nuclear model of atom? | Ernest Rutherford |
| Electrons move in what kind of orbits? | Fixed energy shells |
| Formula for maximum electrons in a shell? | 2n² |
| K shell (n=1): max electrons? | 2 |
| L shell (n=2): max electrons? | 8 |
| M shell (n=3): max electrons? | 18 |
| N shell (n=4): max electrons? | 32 |
| Bohr said electrons __ energy while in orbit? | Do NOT lose |
| When electron jumps to higher shell, it __ energy? | Absorbs |
| When electron jumps to lower shell, it __ energy? | Releases (as light) |
| Who proposed the planetary model of atom? | Niels Bohr |
| Electronic configuration of H (Z=1)? | 1 |
| Electronic configuration of He (Z=2)? | 2 |
| Electronic configuration of Li (Z=3)? | 2,1 |
| Electronic configuration of C (Z=6)? | 2,4 |
| Electronic configuration of Na (Z=11)? | 2,8,1 |
| Electronic configuration of Cl (Z=17)? | 2,8,7 |
| Electronic configuration of Ca (Z=20)? | 2,8,8,2 |
| Electronic configuration of Ne (Z=10)? | 2,8 |
| Electronic configuration of Al (Z=13)? | 2,8,3 |
| Electronic configuration of O (Z=8)? | 2,6 |
| Define isotope? | Atoms with same atomic number (Z) but different mass number (A) |
| Isotopes have same? | Atomic number (Z) |
| Isotopes have different? | Mass number (A) |
| Number of neutrons in ¹H? | 0 |
| Number of neutrons in ²H? | 1 |
| Number of neutrons in ³H? | 2 |
| Name of ²H? | Deuterium |
| Name of ³H? | Tritium |
| RAM formula? | (mass × % + mass × %) / 100 |
| Why is RAM of Cl = 35.5? | 75% ³⁵Cl + 25% ³⁷Cl |
Created by:
stranger01