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Both the proton and the neutron have a mass that is about 1800 times the mass of an electron The proton and neutron masses are approximately equal to 1 u, where u is the atomic mass unit, 166 10 27 kg To determine the approximate mass of the nucleus, multiply the number of neutrons and protons, or mass number, A, by u nuclear mass A(u)

Size of the nucleus Rutherford s experiments produced the first measurements of the size of the nucleus He found that the nucleus has a diameter of about 10 14 m A typical atom might have a radius 10,000 times larger than the size of the nucleus Although the nucleus contains nearly all of the mass of an atom, proportionally the nucleus occupies less space in the atom than the Sun does in the solar system The nucleus is incredibly dense about 14 1018 kg/m3 If a nucleus could be one cubic centimeter, it would have a mass of about one billion tons

Figure 30-1 The nuclides of hydrogen (a) and helium (b) illustrate that all the nuclides of an element have the same numbers of protons, but have different numbers of neutrons Protons are red and neutrons are gray in this drawing

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Looking at the periodic table on page 916, you might notice that the first four elements all have an atomic mass, A, near a whole number Boron, on the other hand, has a mass of 108 u If the nucleus is made up of only protons and neutrons, each with a mass of approximately 1 u, shouldn t the total mass of any atom be near a whole number The puzzle of atomic masses that were not whole numbers was solved with the mass spectrometer You learned in 26 how the mass spectrometer demonstrated that an element could have atoms with different masses For example, in an analysis of a pure sample of neon, not one, but two spots appeared on the film of the spectrometer The two spots were produced by neon atoms of different masses One variety of the neon atom was found to have a mass of 20 u, while the second type had a mass of 22 u All neutral neon atoms have 10 protons in the nucleus and 10 electrons in the atom One kind of neon atom, however, has 10 neutrons in its nucleus, while the other has 12 neutrons The two kinds of atoms are called isotopes of neon The nucleus of an isotope is called a nuclide All nuclides of an element have the same number of protons, but have different numbers of neutrons, as illustrated by the hydrogen and helium nuclides shown in Figure 30-1 All isotopes of a neutral element have the same number of electrons around the nucleus and behave chemically in the same way Average mass The measured mass of neon gas is 20183 u This figure is now understood to be the average mass of the naturally occurring isotopes of neon Thus, while the mass of an individual atom of neon is close to a whole number of mass units, the atomic mass determined from an average sample of neon atoms is not Most elements have several isotopic forms that occur naturally The mass of one isotope of carbon, carbon-12, is now 1 used to define the mass unit One u is defined to be the mass of the 12 carbon-12 isotope A special method of notation is used to describe an isotope A subscript representing the atomic number, or charge, Z, is written to the left of the symbol for the element A superscript written to the left of the symbol is the mass number, A This notation takes the form A X, where X is any Z element For example, carbon-12 is 12C, and the two isotopes of neon, 6 with atomic number 10, are written as 20Ne and 22Ne 10 10.

Any layer-backed view can be animated by using its animator proxy. This is a special object that acts as a substitute for the view itself, setting up an animation corresponding to the method it s sent instead of making an immediate change. For instance, if you want to animate the movement of a view, then instead of setting its frame like this:

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