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chemistry vocab1
chapter 5 vocab
Question | Answer |
---|---|
what is an atom? | the smallest particle of an element that can exist either alone or in combination |
what is an isotope? | : any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties |
what is radioactivity? | the property possessed by some elements or isotopes of spontaneously emitting energetic particles by the disintegration of their atomic nuclei;the rays emitted |
what is a neutron? | an uncharged elementary particle that has a mass nearly equal to that of the proton and is present in all known atomic nuclei except the hydrogen nucleus |
what is a wavelength? | the distance in the line of advance of a wave from any one point to the next point of corresponding phase |
what is frequency? | the number of times that a periodic function repeats the same sequence of values during a unit variation of the independent variable |
what is amplitude? | the maximum departure of the value of an alternating current or wave from the average value |
what is quantum? | any of the very small increments or parcels into which many forms of energy are subdivided |
what is photon? | a unit of intensity of light at the retina equal to the illumination received per square millimeter of a pupillary area from a surface having a brightness of one candle per square meter |