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RAD Imaging ch 2
Carlton & Adler.
| Question | Answer |
|---|---|
| What is matter? | Has mass, occupies space. |
| How do you measure matter? | In kilograms. |
| How do you measure energy? | Joules. |
| How do you measure an X-ray? | Electron volts (eV) |
| What is an atom? | Smallest particle of an ELEMENT |
| what is an element? | pure substance made of only 1 kind of atom. |
| what is a compound? | 2 or more different elements chemically joined |
| what is a molecule? | smallest part of a compound. |
| An atom is to a _____, as a molecule is to a _____. | an atom is to an ELEMENT as a molecule is to a COMPOUND. |
| what is a mixture? | Substance made of 2 or more substances, that are not chemically joined. |
| What is an atomic number? | (Z#) distinguishes elements by number of protons in nucleus. |
| What is Tungstens binding energy? | 69.5 keV |
| Explain binding energy. | Closer electrons are to nucleus, stronger the binding energy. Closer shell electrons have less energy but more binding energy. |
| Atomic mass is? | (A) equal to the number or protons and neutrons in the nucleus. |
| Change neutrons you get.. | An isotope |
| Change atomic number... | you change the element. |
| If you change electrons.. | you make an ion. |
| If an atom gains an electron? | Negative ion. |
| If an atom looses an electron? | Positive ion. |
| An isotope is? | An atom with the same # of protons, but different # of neutrons. |
| Changing what changes the element? | The number of protons. Electrons and neutrons can be changed without changing the element. |
| What is the relationship between wavelength and frequency? | wavelength up, frequency down. |
| Describe the end of the electromagnetic spectrum. | More energy, high frequency, shorter wavelength. |
| Describe the beginning of the em spectrum. | Low energy, low frequency, long wavelength. |
| How is wavelength measured? | Angstroms. |
| How is frequency measured? | Hertz. |
| What are the properties of an X-ray. | -Electrically neutral. -Polyenergetic or heterogeneous energies. -Travel in straight lines. -Speed of light. -Ionize matter. -cause flourescence in some crystals. -Produce secondary and scatter radiation. |
| How are elements similar within each group on the periodic table? (8 vertical groups) | Elements with the same number of electrons in outermost shell. |
| How are elements similar within each period on the periodic table? (7 horizontal periods) | Same number of electron shells. |
| Tungsten has an atomic number of __? | 74 |
| Tungsten's symbol is __? | W |
| Tungsten has how many shells? | 6. K, L, M, N, O, P. (2 electrons in P) |
| One keV equals ___ eV? (kilo-electron volt, electron volt) | 1000 |
| As a wave, EM radiation has an associated ____ and ____. | Wavelength and frequency |
| As a particle, EM radiation behaves as a ___. | Photon, bundle of energy. |
| Covalent bond | Sharing atoms. |
| Ionic bond | One atom gives up one or more electrons to another atom. |
| Valence | The number of atoms that can still be added to the outermost shell is the Valence. Describes elements ability to bond. |
Created by:
Zoest35
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