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chapter5
chapter5

... (a) Principal Energy levels (sometimes called shells) -The energy levels of electrons are labeled by principal quantum numbers (n), which are integers starting at n = 1, 2, 3, 4, and so on. (b) Energy sublevels - For each principal energy level there may be several orbitals with different shapes tha ...
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...  Ionic substances have high melting and boiling points, form crystals, dissolve in water (dissociation), and conduct electricity in solution and as a liquid.  Covalent or molecular substances have lower melting and boiling points, do not conduct electricity.  Polar substances are dissolved only b ...
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... Law of Definite Proportions/Composition = Chemical compounds always contain the same elements in exactly the same proportions by mass regardless of the amount or source of the sample. EX. NaCl always contain 39.34% by mass of Na and 60.66% by mass of Cl. Law of Multiple Proportions = If two or more ...
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...  Ionic substances have high melting and boiling points, form crystals, dissolve in water (dissociation), and conduct electricity in solution and as a liquid.  Covalent or molecular substances have lower melting and boiling points, do not conduct electricity.  Polar substances are dissolved only b ...
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final exam practice test - Clayton State University

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... molecule. • They do not explain why a chemical bond forms. • How can quantum mechanics be used to account for molecular shape? What are the orbitals that are involved in bonding? • We use valence-bond theory. • A covalent bond forms when the orbitals on two atoms overlap. • The shared region of spac ...
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... inhabit. This gives the electrons some wiggle room in order to accelerate. Compare to a classical charged particle in an electric field. As the particle experiences a force, the energy state of the particle changes. If there are no energy states available for the particle to inhabit – it can’t accel ...
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Chemistry Reference Table Review
Chemistry Reference Table Review

... 83. What are two properties of most nonmetals? (1) high ionization energy and poor electrical conductivity (2) high ionization energy and good electrical conductivity (3) low ionization energy and poor electrical conductivity (4) low ionization energy and good electrical conductivity 84. Based on Ta ...
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CHM 101 - Academic Computer Center

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< 1 ... 73 74 75 76 77 78 79 80 81 ... 117 >

Metallic bonding

Metallic bonding occurs as a result of electromagnetism and describes the electrostatic attractive force that occurs between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions. It may be described as the sharing of free electrons among a lattice of positively charged ions (cations). In a more quantum-mechanical view, the conduction electrons divide their density equally over all atoms that function as neutral (non-charged) entities. Metallic bonding accounts for many physical properties of metals, such as strength, ductility, thermal and electrical resistivity and conductivity, opacity, and luster.Metallic bonding is not the only type of chemical bonding a metal can exhibit, even as a pure substance. For example, elemental gallium consists of covalently-bound pairs of atoms in both liquid and solid state—these pairs form a crystal lattice with metallic bonding between them. Another example of a metal–metal covalent bond is mercurous ion (Hg2+2).
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