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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
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1 Three isotopes of uranium have mass numbers of 234, 235, and 238 The atomic number of uranium is 92 How many neutrons are in the nuclei of each of these isotopes 2 An isotope of oxygen has a mass number of 15 How many neutrons are in the nucleus of this isotope 3 How many neutrons are in the mercury isotope 200Hg 80 4 Write the symbols for the three isotopes of hydrogen that have zero, one, and two neutrons in the nucleus
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The negatively charged electrons that surround the positively charged nucleus of an atom are held in place by the attractive electromagnetic force Because the nucleus consists of positively charged protons and neutral neutrons, the repulsive electromagnetic force among the protons might be expected to cause them to fly apart Because this does not happen, an even stronger attractive force must exist within the nucleus
The Strong Nuclear Force
The strong nuclear force, also called the strong force, acts between protons and neutrons that are close together, as they are in a nucleus This force is more than 100 times stronger than the electromagnetic force The range of the strong force is short, only about the radius of a proton, 14 10 15 m It is attractive and is of the same strength among protons and protons, protons and neutrons, and neutrons and neutrons Both neutrons and protons are called nucleons The strong nuclear force holds the nucleons in the nucleus If a nucleon were to be pulled out of a nucleus, work would have to be done to overcome the attractive force Doing work adds energy to the system Thus, the assembled nucleus has less energy than the separate protons and neutrons that make it up The difference is the binding energy of the nucleus Because the assembled nucleus has less energy, all binding energies are negative
Forces A positron is a positively charged electron The electromagnetic attraction of an electron and a positron is 42 1042 times stronger than their gravitational attraction
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