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RAD Imaging ch 2

Carlton & Adler.

QuestionAnswer
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