936385
Description
Flashcards by Chuleeporn Thanomsilp, updated more than 1 year ago
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Created by Chuleeporn Thanomsilp
about 10 years ago
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| Question | Answer |
| Define : The law of constant composition | for a given compound, the relative number and type of atoms are constant |
| Define: The law of conservation of mass | Mass is neither created nor destroyed in chemical reactions. The total mass of materials present after a chemical reaction is the same as the total mass before the reaction. |
| Define: the law of multiple proportions | two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the second element are in the ratio of small whole numbers |
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Image:
dalton_s_model (image/jpg)
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Dalton |
| Who is named for the discovery of electron? | J.J.Thomson |
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Image:
thomson (image/jpg)
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J.J.Thomson |
| What is the result from the MILLIKAN’S OIL-DROP EXPERIMENT? | Charge of electron (-1.602 x 10^-19 Coulomb) |
| Who suggested the NUCLEAR MODEL OF THE ATOM ? | Ernest Rutherford from the effect of bombarding thin gold foil with alpha radiation |
| the three most important subatomic particles | proton, neutron, electron |
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Image:
nucleus_symbol (image/jpg)
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A IS MASS NUMBER, Z IS ATOMIC NUMBER AND X IS ATOMIC SYMBOL OR ELEMENT SYMBOL. |
| What is the nucleus symbol? proton = 47 neutron = 60 electron = 46 |
Image:
nucleus_symbol_2 (image/jpg)
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Image:
nucleus_symbol_3 (image/jpg)
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20 protons, 20 neutrons and 18 electrons |
| What is isotope? | The elements with the same atomic number but different mass numbers. |
| Light or energy consists of particles which are called _________. | photons |
| What is the frequency of light with wavelength of 455 nm? | 6.59 × 10^14 s-1 |
| A particular orbital is designated by which quantum numbers ? | n, l and ml |
| Is this set of quantum numbers possible? n = 2, l = 2, ml = –2 | not possible, l must be less than n. |
| Is this set of quantum numbers possible? n = 4, l = 2, ml = –2 | yes, l can be 0,1,2,3 for l =2 ml can be -2,-1,0,1,2 |
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Image:
bohr (image/jpg)
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Niels Bohr |
| Atomic orbital | A specific set of quantum numbers. The area where it is high possibility to find electrons. |
| What is the possible values of the spin quantum number (ms)? | The possible values are +½ and – ½. |
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Image:
p_orbitals (image/jpg)
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p orbitals |
| What is the shape of s orbitals? | sphere |
| How many d orbitals in d subshell? | 5 orbitals |
| Which quantum number identify the orientation of atomic orbital? | the magnetic quantum number (ml) |
| Which quantum number identify the energy of the orbital? | the principal quantum number (n) |
| Which quantum number identify the shape of atomic orbital? | the orbital angular momentum quantum number ( l ) |
| What is the possible values of the n quantum number? | positive integer number (n = 1,2,3,...) |
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Image:
d_orbitals (image/jpg)
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d orbitals |
| What is cation? | Positively charged ion occurs when an atom loses electron (s). It has more protons than electrons. |
| What is anion? | Negatively charged ion occurs when an atom gains electron(s). It has fewer protons than electrons. |
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